JAVASCRIPT

How to check whether a string contains a substring in JavaScript?

ECMAScript 6 introduced String.prototype.includes:

const string = "foo";
const substring = "oo";

console.log(string.includes(substring)); // true

javascript check if string contains a text substring

stringVariable.includes("Your Text");

How to Check if a Substring is in a String in JavaScript Using the includes() Method

// Here's what the syntax looks like:
// string.includes(substring, fromIndex)

// Here's an example:

const bio = "I am a web developer";
console.log(bio.includes("web"));
// true

javascript - How do I check if string contains substring?

if (str.toLowerCase().indexOf("yes") >= 0)

How to check whether a string contains a substring in JavaScript?

ECMAScript 6 introduced String.prototype.includes:

const string = "foo";
const substring = "oo";

console.log(string.includes(substring)); // true

how to check if string contains substring javascript

const string = "javascript";
const substring = "script";

console.log(string.includes(substring));

How to check whether a string contains a substring in JavaScript?

There is a String.prototype.includes in ES6:

"potato".includes("to")

Contains Substring

single = "a"
many = "aaaaaaaa"
print(single in many)
#True since a is in aaaaaaaa