How to check whether a string contains a substring in JavaScript

Question: How to check whether a string contains a substring in JavaScript

Answer:

First: Using 'includes()'.

const string = "RustcodeWeb";
const substring1 = "code";
const substring2 = "Web";

console.log(string.includes(substring1));
console.log(string.includes(substring2));

Output:

true
true

Second: Using 'indexof'.

const string = "RustcodeWeb";
const substring1 = "code";
const substring2 = "Web";

console.log(string.indexOf(substring1) !== -1);
console.log(string.indexOf(substring2) !== -1);

Output:

true
true

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