JavaScript - String includes() method

In this post, we will discuss about string includes() method in JavaScript. includes() is a method used to find the given sub-string is present in the parent string.

Let us create the String for demonstration.

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let string1=' I like the JavaScript and JavaScript is popular and easy learn and gets job easily with JavaScript skill.';
console.log(string1);

Output:

I like the JavaScript and JavaScript is popular and easy learn and gets job easily with JavaScript skill.

String includes() :

includes() method used to find the given sub-string is present in the parent string.

includes() syntax:

String. includes('sub-string')

Where 'sub-string' is the given string to check whether parent contains this sub-string. If its present this includes() method will returns 'true' otherwise 'false'.

includes() example 1:

create a string declaration with sentence and find whether given sub-string is present in the parent string.

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let str='I like the JavaScript and JavaScript is popular and easy learn and gets job easily with JavaScript skill.';
console.log('parent string = '+str);
let substring = 'JavaScript';
console.log('parent string contains JavaScript? '+str.includes(substring));

Execution Steps:

  1. Copy the above example code.
  2. Open the browser(chrome or Microsoft edge) and press(ctrl+shift+I).
  3. Go to the console tab.
  4. Paste the copied code into console and press enter button.

Output:

parent string = I like the JavaScript and JavaScript is popular and easy learn and gets job easily with JavaScript skill.
parent string contains JavaScript? true

includes() example 2:

In this example, we will explore includes() method by passing the non-existent sub-string and log the output to the console.

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let str='student who gets first marks that student will be eligible for scholarship';
console.log('Given String = '+str);
let substring = 'students';
console.log('parent string contains students? '+str.includes(substring));

Execution Steps:

  1. Copy the above example code.
  2. Open the browser(chrome or Microsoft edge) and press(ctrl+shift+I).
  3. Go to the console tab.
  4. Paste the copied code into console and press enter button.

Output:

Given String = student who gets first marks that student will be eligible for scholarship
parent string contains students? False