Added String methods

Author: nikhilmopidevi

_posts/2019-11-28-Commonly used JavaScript functions.markdown

@@ -0,0 +1,42 @@
+---
+layout: post
+title: "Commonly used JavaScript String, Array, and Object methods"
+date: 2019-11-28 10:00:00 +0530
+tags: [JavaScript, functions, methods]
+comments: true
+---
+
+## Introduction
+
+In this post, we will look at some commonly used JavaScript String, Array, and Object methods and some insights on choosing the right method based on the task.
+
+Clicking on a method name opens a new tab with its MDN documentation. You can refer it for more information and usage examples.
+
+## String methods
+Following are some of the common methods from the [String][String] global object.
+
+- [indexOf()][String.prototype.indexOf()] - This method returns the index of the passed string within the string. Returns -1 if the value is not found.
+- [includes()][String.prototype.includes()] - This method returns _true_ or _false_ based on whether the passed string exists within the string.
+
+Use `indexOf()` if you need the position of the passed string in the string. Use `includes()` if you are only concerned whether the passed string exists, it makes intent of the code more clear.
+
+- [trim()][String.prototype.trim()] - This method removes whitespace from both ends of a string.
+- [split()][String.prototype.split()] - This method returns an array of strings by separating the string at each instance of a specified separator string.
+- [substring()][String.prototype.substring()] - This method returns the part of the string between the start and end indexes.
+- [slice()][String.prototype.slice()] - This method is quite similar to `substring()` with some [differences][StackOverflow - slice() vs substring()].
+
+[String]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String 
+{:target="_blank"}
+[String.prototype.indexOf()]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/indexOf 
+{:target="_blank"}
+[String.prototype.includes()]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/includes 
+{:target="_blank"}
+[String.prototype.trim()]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/trim 
+{:target="_blank"}
+[String.prototype.split()]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/split 
+{:target="_blank"}
+[String.prototype.substring()]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/substring 
+{:target="_blank"}
+[String.prototype.slice()]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/slice 
+{:target="_blank"}
+[StackOverflow - slice() vs substring()]: https://stackoverflow.com/a/2243835/2924577