Inarray example code allows you to check whether the value exists in an array. If the value exists the code returns the array position, else it returns as -1.Simple jquery inarray code is given below.
<style>
div {color: red;}
span {color: green;}
</style>
<div>"car" is in the array <span></span></div>
<div>4 is in the array <span></span></div>
<div>"bus" is in the array <span></span></div>
<div>"plain" is in the array <span></span></div>
<script src="https://code.jquery.com/jquery-1.10.2.js"></script>
<script type='text/javascript'>
var demoarr = ['car','bike','train','bus'];
var ele = $("span");
ele.eq( 0 ).text( jQuery.inArray( "car", demoarr ) );
ele.eq( 1 ).text( jQuery.inArray( 4, demoarr ) );
ele.eq( 2 ).text( jQuery.inArray( "bus", demoarr ) );
ele.eq( 3 ).text( jQuery.inArray( "plain", demoarr, 2 ) );
</script>