How to use contains in js

The contains() method in JavaScript is used to determine whether a string contains another substring. Returns true if included; otherwise, returns false.

contains() usage in JavaScript

Answer the question:
contains () method is used to determine whether a string contains another substring. Returns true if included; otherwise, returns false.

Expand answer:

Grammar:

<code>string.contains(substring)</code>

Among them,

• string is the string to search for.
• substring is the substring to be found.

Parameters:

Return value:

Example:

<code>const str = "Hello, World!";

console.log(str.includes("Hello")); // 输出：true
console.log(str.includes("Universe")); // 输出：false</code>

Note:

• contains() method is not case sensitive.
• Always returns true if the substring is the empty string.
• contains() method is a built-in method in JavaScript and can be used without importing any library.

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