contains function in js code example

Example 1: javascript string contains

var string = "foo",
    substring = "oo";

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

Example 2: javascript string contains function

s = "Hello world";
console.log(s.includes("world"));

Example 3: js string contains

var string = "foo";
var substring = "oo";

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

Example 4: string contains javascirpt

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

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

Example 5: string contains js

var str = "foobar"
var regex = /foo/g;
if (str.search(regex) !== -1) {
  alert("string conains foo!")
}