if string contains jquery code example

Example 1: if string javascript

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

Example 2: if str contains jquery

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

Example 3: javascript string contains

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

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

Example 4: jquery contains text

$( "div:contains( 'hello' )" )