JavaScript slice() String | Extract Substring from String

Get/extract substring from string in javascript; In this tutorial, you will learn how to extract substring from string in javascript usingString slice() method without regex.

Sometimes, when you work with javascript strings and you want to extract a substring or part of the string from a given string using the js built-in string method. Hence, this tutorial is very helpful for you.

JavaScript String slice() method

The js stringslice() method extracts a part of a string (substring) and returns a new string.

The syntax of slice() method is the following:

let substr = str.slice(begin [, end ]);

Here,

• The begin is a position where to start the extraction.
• The end  is a position where to end the extraction.

Note that, some important thing about the js string slice()  method parameters,

• If you ignore the end, the slice() extracts to the end of the string.
• If the begin or end is negative, the slice() treats it as str.length + begin or str.length+ end.

Return a new string substring of given string included between the begin and end indexs.

Examples: JavaScript String slice() method

Let’s take look at examples of using the javascript string slice() method.

The following example shows uses of slice() method, to extract part of string from a given string with beingIndex:

let str = 'Hello JavaScript'
let newStr = str.slice(5);

console.log(newStr); // JavaScript

The following example shows uses of slice() method, to extract part of string from a given string with beingIndex and endIndex:

let str = 'Hello JavaScript'
let newStr = str.slice(0, 5);

console.log(newStr); // Hello

Next example shows how to extract part of a string from a given string using the javascript string slice() and indexOf() method, see the following:

let email = '[email protected]'
let newStr = email.slice(0,email.indexOf('@'));

console.log(newStr); // mygmail

The following example shows, how to extract only the last character from a given string, see the following:

var str = "Hello world!";
var res = str.slice(-1);

console.log(res); // !

Conclusion

In this tuorial, you have learned all about the JavaScript String slice() method and using this method extract a substring from a given string.

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