how to check presence of any character in string js code example

Example 1: angular string contains

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

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

Example 2: string.contains javascript

var str = "We got a poop cleanup on isle 4.";
if(str.indexOf("poop") !== -1){
	alert("Not again");
}

Example 3: javascript string contains

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

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