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- Challenge Access Array Data with Indexes
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- Challenge Accessing Nested Arrays In Json
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- Challenge Accessing Objects Properties With Bracket Notation
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- Challenge Add a Negative Margin to an Element
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- Challenge Add Alt Text to an Image for Accessibility
- Challenge Add Borders Around your Elements
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- Challenge Add Elements within your Bootstrap Wells
- Challenge Add Font Awesome Icons to all of our Buttons
- Challenge Add Font Awesome Icons to our Buttons
- Challenge Add ID Attributes to Bootstrap Elements
- Challenge Add Images to your Website
- Challenge Add New Properties to a JavaScript Object
- Challenge Add Placeholder Text to a Text Field
- Challenge Add Rounded Corners with a Border Radius
- Challenge Add Two Numbers with JavaScript
- Challenge Add your JavaScript Slot Machine Slots
- Challenge Adding A Default Option In Switch Statements
- Challenge Adjust the Margin of an Element
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- Challenge Appending Variables to Strings
- Challenge Apply the Default Bootstrap Button Style
- Challenge Assignment With A Returned Value
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- Challenge Assignment with Minus Equals
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- Challenge Bring your JavaScript Slot Machine to Life
- Challenge Build JavaScript Objects
- Challenge Call out Optional Actions with Button Info
- Challenge Center Text with Bootstrap
- Challenge Chaining If Else Statements
- Challenge Change Text Inside an Element Using jQuery
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- Challenge Change the Color of Text
- Challenge Change the CSS of an Element Using jQuery
- Challenge Change the Font Size of an Element
- Challenge Check Radio Buttons and Checkboxes by Default
- Challenge Check the Length Property of a String Variable
- Challenge Clone an Element Using jQuery
- Challenge Comment out HTML
- Challenge Comment your JavaScript Code
- Challenge Comparison With The Equality Operator
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- Challenge Comparisons With The Logical And Operator
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- Challenge Concatenate Strings with .concat
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- Challenge Condense arrays with reduce
- Challenge Construct JavaScript Objects with Functions
- Challenge Constructing Strings with Variables
- Challenge Convert JSON Data to HTML
- Challenge Count Backwards With a For Loop
- Challenge Create a Block Element Bootstrap Button
- Challenge Create a Bootstrap Button
- Challenge Create a Bootstrap Headline
- Challenge Create a Bootstrap Row
- Challenge Create a Bulleted Unordered List
- Challenge Create a Class to Target with jQuery Selectors
- Challenge Create a Custom Heading
- Challenge Create a Form Element
- Challenge Create a JavaScript Slot Machine
- Challenge Create a Set of Checkboxes
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- Challenge Create a Text Field
- Challenge Create an Ordered List
- Challenge Create Bootstrap Wells
- Challenge Create Decimal Numbers with JavaScript
- Challenge Declare JavaScript Objects as Variables
- Challenge Declare JavaScript Variables
- Challenge Declare String Variables
- Challenge Decrement a Number with Javascript
- Challenge Delete HTML Elements
- Challenge Delete Properties from a JavaScript Object
- Challenge Delete your jQuery Functions
- Challenge Disable an Element Using jQuery
- Challenge Ditch Custom CSS for Bootstrap
- Challenge Divide One Number by Another with JavaScript
- Challenge Escape Sequences in Strings
- Challenge Escaping Literal Quotes in Strings
- Challenge Fill in the Blank with Placeholder Text
- Challenge Filter Arrays with filter
- Challenge Find Numbers with Regular Expressions
- Challenge Find the Length of a String
- Challenge Find White Space with Regular Expressions
- Challenge Finding a Remainder in Javascript
- Challenge Generate Random Fractions with JavaScript
- Challenge Generate Random Whole Numbers with JavaScript
- Challenge Generate Random Whole Numbers within a Range
- Challenge Get Geo location Data
- Challenge Get JSON with the jQuery getJSON Method
- Challenge Give a Background Color to a Div Element
- Challenge Give Each Element a Unique ID
- Challenge Give your JavaScript Slot Machine some stylish images
- Challenge Global Scope And Functions
- Challenge Global Vs Local Scope In Functions
- Challenge Headline with the h2 Element
- Challenge House our page within a Bootstrap Container Fluid Div
- Challenge Import a Google Font
- Challenge Increment a Number with Javascript
- Challenge Inform with the Paragraph Element
- Challenge Inherit Styles from the Body Element
- Challenge Initializing Variables with the Equal Operator
- Challenge Introducing Else If Statements
- Challenge Introducing Else Statements
- Challenge Introducing Javascript Object Notation Json
- Challenge Invert Regular Expression Matches with JavaScript
- Challenge Iterate Odd Numbers With a For Loop
- Challenge Iterate over Arrays with map
- Challenge Iterate Through An Array With A For Loop
- Challenge Iterate with JavaScript For Loops
- Challenge Iterate with JavaScript While Loops
- Challenge Join Strings with .join
- Challenge Label Bootstrap Buttons
- Challenge Label Bootstrap Wells
- Challenge Learn how Script Tags and Document Ready Work
- Challenge Line up Form Elements Responsively with Bootstrap
- Challenge Link to External Pages with Anchor Elements
- Challenge Local Scope And Functions
- Challenge Make Circular Images with a Border Radius
- Challenge Make Dead Links using the Hash Symbol
- Challenge Make Images Mobile Responsive
- Challenge Make Instances of Objects with a Constructor Function
- Challenge Make Object Properties Private
- Challenge Make Unique Objects by Passing Parameters to our Constructor
- Challenge Manipulate Arrays With pop()
- Challenge Manipulate Arrays With push()
- Challenge Manipulate Arrays With shift()
- Challenge Manipulate Arrays With unshift()
- Challenge Manipulate JavaScript Objects
- Challenge Modify Array Data With Indexes
- Challenge Multiple Identical Options In Switch Statements
- Challenge Multiply Two Numbers with JavaScript
- Challenge Nest an Anchor Element within a Paragraph
- Challenge Nest Many Elements within a Single Div Element
- Challenge Nest one Array within Another Array
- Challenge Nesting For Loops
- Challenge Override All Other Styles by using Important
- Challenge Override Class Declarations by Styling ID Attributes
- Challenge Override Class Declarations with Inline Styles
- Challenge Override Styles in Subsequent CSS
- Challenge Passing Values To Functions With Arguments
- Challenge Perform Arithmetic Operations on Decimals with JavaScript
- Challenge Prefilter JSON
- Challenge Prioritize One Style Over Another
- Challenge Quoting Strings with Single Quotes
- Challenge Remove an Element Using jQuery
- Challenge Remove Classes from an element with jQuery
- Challenge Render Images from Data Sources
- Challenge Replacing If Else Chains With Switch
- Challenge Responsively Style Checkboxes
- Challenge Responsively Style Radio Buttons
- Challenge Return A Value From A Function With Return
- Challenge Return Early Pattern For Functions
- Challenge Returning Boolean Values From Functions
- Challenge Reverse Arrays with reverse
- Challenge Save your Code Revisions Forever with Git
- Challenge Say Hello to HTML Elements
- Challenge Selecting From Many Options With Switch Statements
- Challenge Set the Font Family of an Element
- Challenge Set the ID of an Element
- Challenge Sift through Text with Regular Expressions
- Challenge Size your Images
- Challenge Solution Template
- Challenge Sort Arrays with sort
- Challenge Specify How Fonts Should Degrade
- Challenge Split Strings with split
- Challenge Split your Bootstrap Row
- Challenge Store Multiple Values in one Variable using JavaScript Arrays
- Challenge Storing Values with the Equal Operator
- Challenge Style Multiple Elements with a CSS Class
- Challenge Style Text Inputs as Form Controls
- Challenge Style the HTML Body Element
- Challenge Subtract One Number from Another with JavaScript
- Challenge Target a Specific Child of an Element Using jQuery
- Challenge Target Elements by Class Using jQuery
- Challenge Target Elements by ID Using jQuery
- Challenge Target Even Numbered Elements Using jQuery
- Challenge Target HTML Elements with Selectors Using jQuery
- Challenge Target the Children of an Element Using jQuery
- Challenge Target the Parent of an Element Using jQuery
- Challenge Target the same element with multiple jQuery Selectors
- Challenge Taste the Bootstrap Button Color Rainbow
- Challenge Testing Objects For Properties
- Challenge Trigger Click Events with jQuery
- Challenge Turn an Image into a Link
- Challenge Uncomment HTML
- Challenge Understand Boolean Values
- Challenge Understand String Immutability
- Challenge Understanding Case Sensitivity in Variables
- Challenge Understanding Uninitialized Variables
- Challenge Updating Object Properties
- Challenge Use a CSS Class to Style an Element
- Challenge Use Abbreviated Hex Code
- Challenge Use an ID Attribute to Style an Element
- Challenge Use appendTo to Move Elements with jQuery
- Challenge Use Bracket Notation to Find the First Character in a String
- Challenge Use Bracket Notation to Find the Last Character in a String
- Challenge Use Bracket Notation to Find the Nth Character in a String
- Challenge Use Bracket Notation to Find the Nth to Last Character in a String
- Challenge Use Clockwise Notation to Specify the Margin of an Element
- Challenge Use Clockwise Notation to Specify the Padding of an Element
- Challenge Use Comments to Clarify Code
- Challenge Use Conditional Logic with If Else Statements
- Challenge Use CSS Selectors to Style Elements
- Challenge Use Hex Code for Specific Colors
- Challenge Use Hex Code for Specific Shades of Gray
- Challenge Use Hex Code to Color Elements Blue
- Challenge Use Hex Code to Color Elements Gray
- Challenge Use Hex Code to Color Elements Green
- Challenge Use Hex Code to Color Elements Red
- Challenge Use Hex Code to Color Elements White
- Challenge Use Hex Code to Mix Colors
- Challenge Use HTML5 to Require a Field
- Challenge Use jQuery to Modify the Entire Page
- Challenge Use Responsive Design with Bootstrap Fluid Containers
- Challenge Use RGB to Color Elements Blue
- Challenge Use RGB to Color Elements Gray
- Challenge Use RGB to Color Elements Green
- Challenge Use RGB to Color Elements Red
- Challenge Use RGB to Color Elements White
- Challenge Use RGB to Mix Colors
- Challenge Use RGB values to Color Elements
- Challenge Use Spans for Inline Elements
- Challenge Use the Bootstrap Grid to Put Elements Side By Side
- Challenge Use the Javascript Console
- Challenge Using Objects For Lookups
- Challenge Using typeof
- Challenge Warn your Users of a Dangerous Action
- Challenge Write Reusable JavaScript with Functions
- Check if an element is hidden using jQuery
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- Checkpoint Convert Celsius to Fahrenheit
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- code case
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- CONTRIBUTING
- Contributions Guide with Typo Demo
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- Creating a new API endpoint
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- css
- css selectors
- Currying
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- equality vs identity
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- For loops Explained
- Free Code Camp Back End Development Certification
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- Free Code Camp is an open source community distributed across many platforms
- Free Code Camp JavaScript Style Guide
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- Front End Project Use the Twitchtv JSON API
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- Get info about the current user
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- How GitHub Issue Moderators AKA Issue Mods Work
- How JSONP is different from JSON
- How Long Free Code Camp Takes
- How to add Free Code Camp to my LinkedIn profile
- How to best use the Global Control Shortcuts for Mac
- How to clear specific values from your browser's local storage
- How to clone the FreeCodeCamp website on a Windows pc
- How To Contribute To The Wiki
- How to create a Campsite for your city
- How To Create A Pull Request for Free Code Camp
- How to deploy a website without writing any code at all
- How To Fork And Maintain a Local Instance of Free Code Camp
- How to Get Help on Gitter
- How to get help when you get stuck
- How to get the MEAN stack running locally on OSX
- How To Install Clementine
- How to install Screenhero
- How to know who is in charge of your Campsite on Facebook
- How To Log In To Your Local FCC Site
- how to post code
- How to Rename a Local Branch
- How to share your workspace selfie with FreeCodeCamp on instagram
- How to start when you are stuck (I)
- How to start when you are stuck (II)
- How to start when you are stuck (III)
- How to use the Free Code Camp Wiki
- How you can get to Inbox Zero with Gmail shortcuts
- How you can help to stimulate your city's Campsite on Facebook
- How you can reach the Free Code Camp team to interview them for your publication
- Html and CSS Cheat Sheet
- html elements
- If Free Code Camp is free, how does it make money
- Ignore Files Committed To Git Repo
- IIFE
- Install Django Flask
- Installing WordPress Locally on Mac
- Intro to Yeoman Angular Fullstack Back End Projects
- isLoggedInAsync
- Java
- Java Basics
- Java Introduction
- Java Loops
- Java Resources
- Javascript Callback Functions
- JavaScript Truth Table
- jQuery
- js arguments
- js Array prototype concat
- js Array prototype every
- js Array prototype filter
- js Array prototype forEach
- js Array prototype indexOf
- js Array prototype join
- js Array prototype lastIndexOf
- js Array prototype map
- js Array prototype pop
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- js Array prototype reduce
- js Array prototype reverse
- js Array prototype shift
- js Array prototype slice
- js Array prototype some
- js Array prototype sort
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- js Array prototype toString
- js Boolean
- js closures
- JS Comparison Operators
- JS Current URL
- js falsy
- js for in loop
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- js functions
- JS Get Timestamp
- js Global Object
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- js loops
- JS Regex Resources
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- js Scopes
- JS Strict Mode
- js String prototype charAt
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- js String prototype concat
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- js String prototype lastindexOf
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- js String prototype substr
- js String prototype substring
- js String prototype toLowerCase
- js String prototype toUpperCase
- js ternary
- js truthy
- js undefined
- jsonp
- Know it all
- Known Issues With Codepen
- latex
- Learn the basics of the VIM editor
- Linking Your Account with GitHub
- Linux
- List of Free Code Camp city based Campsites
- Loop Protect
- Map
- materializecss framework as a bootstrap alternative
- Math.max
- Math.min
- Math.pow
- medium example wiki article
- More useful APIs
- Mostaganem
- Object.getOwnPropertyNames
- Object.keys
- October 2015 Improvements
- October 2015 Summit Agenda
- Official Free Code Camp Chat Rooms
- ooda
- Other resources that Free Code Camp recommends to nonprofits
- Page redirects using javascript
- Pair programming and why it is special
- parseInt
- Permutations
- Php
- Politica De Honestidad Academica
- Programming Fundamental
- Programming Methodology
- Promises
- Pseudoclassical class definition OOp
- Pull Request Contribute
- PULL_REQUEST_TEMPLATE
- Python
- Python Basics
- Python Functions
- Python Introduction
- Python More Builtin Types
- Python Operators
- Python Resources
- Quick tip keep data in sync
- README
- Reduce made easy
- Refresh Your Browser Cache
- Registering your Nonprofit to Raise Donations through Free Code Camp Commit
- Restrict a page to authenticated users
- RTFM
- Ruby
- Ruby Introduction
- Run Apache Server On A Mac
- Saturday Summit August 2015
- Saturday Summit December 2015
- Saturday Summit November 2015
- Saturday Summit October 2015
- Searching for Your Issue on Github
- Seed data
- Select Issues for Contributing Using Labels
- Setting Up A React ES6 Webpack Project
- Site Improvements August 2015
- Site Improvements October 2015
- Slack
- Spanish Translation Terminology
- staging
- Start Here
- Streaks
- Stream Your Coding Sessions on Twitch.tv
- String.fromCharCode
- String.length
- Swashbuckle Swagger Operation Alphabetical Order
- The main advantages of Free Code Camp
- The Return Early Pattern
- Tips on How To Become A Good Pair Programmer
- topic
- Translating Free Code Camp into Your Native Language
- Translations Guide
- Twitch
- up_and_running_with_sass
- update
- Updates February 11 2016
- using anonymous self executing functions for private namespacing in your js apps
- Using browsec for securing your connection to fcc
- Using Github Pages for your front end development projects
- video demo
- wat
- Web Development in Python
- Web Resources
- What exactly Free Code Camp does
- What pair programming is and why it is special
- What the main advantages of Free Code Camp are
- What the style guide for Algorithms is
- What to do if you speak a language that Free Code Camp does not yet support
- What you will learn, and in what sequence you will learn it
- Why does Free Code Camp use JavaScript instead of Ruby or Python
- Why you need Free Code Camp
- Why You Should Try Pair Programming
- wiki js template
- Wiki Style Guide
- World Language Chat Rooms
- Write and Run ES6 Code in Browser
- writing a markdown file using atom
- Writing great git commit message
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New to Free Code Camp?
JS Concepts
JS Language Reference
- arguments
- Array.prototype.filter
- Array.prototype.indexOf
- Array.prototype.map
- Array.prototype.pop
- Array.prototype.push
- Array.prototype.shift
- Array.prototype.slice
- Array.prototype.some
- Array.prototype.toString
- Boolean
- for loop
- for..in loop
- for..of loop
- String.prototype.split
- String.prototype.toLowerCase
- String.prototype.toUpperCase
- undefined
Other Links
Clone this wiki locally
Welcome to the Free Code Camp Wiki!
Our open source community's Wiki focuses on answering your questions about learning to code and getting a coding job. We also cover in detail our:
- Curriculum
- Local Campsite Communities
- Nonprofit Projects
The best way to access this wiki is via CamperBot, located in our Gitter channels. CamperBot is a community designed tool useful for accessing our wiki content without ever leaving Gitter.
Contributing to the Wiki
To contribute a wiki article for any of the Algorithms, please use this template. This is essential for @CamperBot to retrieve the article. Algorithm articles that do not use this template will be removed. Please note that while we will publish solutions that can help others, we don't need many of them and a maximum of three solutions will be accepted in the following categories:
- Basic
- Intermediate
- Advance
One code solution per category. If we already have enough solutions and yours is similar to one we already have but you strongly feel like yours will bring something important then we encourage you to merge your solution with the similar one we already have and expand or write a detailed explanation of the code.
If you want to contribute but have no idea what you would like to contribute then feel free to check the open issues we have with request for articles or fixes to them here.
We welcome any technology relate articles, not just JavaScript related or Curriculum specific. However, we do ask that you write them in third person instead of first person perspective. We also welcome articles in other languages, and welcome translations of current articles.
If we merge your pull request, your name will be automatically added to the document history on GitHub, and the repo's contributors. Please don't add additional bylines when creating or editing an article.
Guides on how to Contribute
- How To Contribute From Your Browser This is currently the easiest way we have to contribute. A simplified version can be found on here also.
- Pull Request Guidelines
- How To Contribute To The Wiki: This is a guide that will show you how to have a local copy so you can make changes from your computer, it also works for contributing to the main repository.
- More on how to make a pull request from a fork
- How to Squash Commits: We required only one commit per Pull Request unless otherwise specified by a moderator.
If you have questions about contributing to the Free Code Camp Wiki message @Rafase282 in Gitter or come the Gitter Wiki Room.
We look forward to collaborating with you on expanding and improving this wiki!
Learn to code and help nonprofits. Join our open source community in 15 seconds at http://freecodecamp.com
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