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:

Parameters	Description
substring	The substring to be found

Return value:

Return value	Description
true	If the string contains subcharacters String
false	If the string does not contain a substring

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.

The above is the detailed content of How to use contains in js. For more information, please follow other related articles on the PHP Chinese website!