check if string contains code example

Example 1: if string javascript

if (typeof myVar === 'string') { /* code */ };

Example 2: check if string contains javascript

var str = "Hello world, welcome to the universe.";

var n = str.includes("world");

Example 3: if str contains jquery

if (str.indexOf("Yes") >= 0)
  
  //case insensitive version
  if (str.toLowerCase().indexOf("yes") >= 0)

Example 4: check for substring javascript

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

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

Example 5: check if word is in string javascript

var str = "Hello world, welcome to the universe.";
var n = str.includes("world");

Example 6: javascript string contains

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

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