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<!DOCTYPE html>
<html>
<body>
​
<p>The in operator returns true if the specified property is in the specified object.</p>
​
<p id="demo"></p>
​
<script>
// Arrays
var cars = ["Saab", "Volvo", "BMW"];
// Objects
var person = {firstName:"John", lastName:"Doe", age:50};
​
document.getElementById("demo").innerHTML =
  ("Saab" in cars) + "<br>" + 
  (0 in cars) + "<br>" +
  (1 in cars) + "<br>" +
  (4 in cars) + "<br>" +
  ("length" in cars) + "<br>" +
​
  ("firstName" in person) + "<br>" +
  ("age" in person) + "<br>" +
​
  // Predefined objects
  ("PI" in Math) + "<br>" +
  ("NaN" in Number) + "<br>" +
  ("length" in String);
</script>
​
</body>
​
<!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_oper_in by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 03:01:32 GMT -->
</html>
​
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