Array.indexOf
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<!DOCTYPE html> <html> <body> <h2>JavaScript Array.indexOf()</h2> <p id="demo"></p> <script> var fruits = ["Banana", "Orange", "Apple", "Mango"]; var a = fruits.indexOf("Apple"); document.getElementById("demo").innerHTML = "Apple is found in position " + (a + 1); </script> <p>The indexOf() does not work in Internet Explorer 8 and earlier versions.</p> </body> </html>