new String.prototype

FreeCodeCamp · f13ccfff6ddb0c3f07c63d17b180a436c7f77a1d · faizaanceg committed Nov 18, 2015 · Nov 18, 2015 · f13ccff
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+# String.prototype.concat()
+
+The concat() method combines the text of two or more strings and returns a new string.
+
+**Syntax**
+```js
+str.concat(string2, string3[,..., stringN]);
+```
+
+### Parameters
+
+**string2...string*N***
+The strings which are to be concatenated to this String.
+
+## Description 
+
+The concat() method combines the text of two or more strings and returns the concatenated string. It does not modify the original strings.
+
+## Examples
+
+**Concatenating strings**
+```js
+var str1 = "Hello";
+var str2 = "World";
+console.log(str1.concat(str2));
+// Console will output: HelloWorld
+
+var str2 = "Hello, ";
+console.log(str2.concat(" Welcome ", "to FCC."));
+// Console will output: Hello, Welcome to FCC.
+
+```
+
+
+Source [MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/concat)
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+# String.prototype.indexOf()
+
+The indexOf() method returns the index within the calling String object of the first occurrence of the specified value, starting the search at fromIndex. Returns -1 if the value is not found.
+
+**Syntax**
+```js
+str.indexOf(searchValue[, *fromIndex*]);
+```
+
+### Parameters
+
+**searchValue**
+A character/string whose index is to be found.
+
+**fromIndex**
+Optional. The location within the calling string to start the search from. It can be any integer. The default value is 0. If `fromIndex < 0` the entire string is searched (same as passing 0). If `fromIndex >= str.length`, the method will return -1 unless `searchValue` is an empty string in which case `str.length` is returned.
+
+## Description 
+
+Characters in a string are indexed from left to right. The index of the first character is 0, and the index of the last character of a string called `str` is `str.length - 1`.
+
+## Examples
+
+**Finding a character in a string**
+```js
+var str1 = "Hello";
+console.log(str1.indexOf('H'));
+// Console will output: 0
+
+var str1 = "Hello";
+console.log(str1.indexOf('Y'));
+// Console will output: -1.
+
+```
+
+**indexOf() is case-sensitive**
+```js
+var str1 = "Hello";
+console.log(str1.indexOf('ello'));
+// Console will output 1
+
+var str1 = "Hello";
+console.log(str1.indexOf('Ello'));
+// Console will output -1
+
+```
+
+**indexOf() with fromIndex**
+```js
+var str1 = "FreeCodeCamp is a place for people to learn";
+console.log(str1.indexOf('Camp'));
+// Console will output 8
+
+console.log(str1.indexOf('Camp', 9));
+// Console will output -1
+
+```
+
+Source [MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/indexOf)