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Editorial Team
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Asked: 2026-06-04T02:54:20+00:00

Just to illustrate what I want to do I’ll pase this sample code for

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Just to illustrate what I want to do I’ll pase this sample code for example:

<html>
<head>
</head>
<body>
<script type="text/javascript">
function oc(a)
{
  var o = {};
  for(var i=0;i<a.length;i++)
  {
    o[a[i]]='';
  }
  return o;
}
if ( "Island" in oc(["Hello","Hello World","Have","Island"]) )
{
document.write("Yes");
}
</script>
</body>
</html>

In this case I get Yes on my page, but if I change the condition like:

if ( “Isl” in oc([“Hello”,”Hello World”,”Have”,”Island”]) )

the function doesn’t find match. What is the best way to perform such kind of check which will return true even if only part of the string match?

Thanks

Leron

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1 Answer

  1. Editorial Team

    Use .indexOf():

    var str = 'hello world'
if (str.indexOf('lo') >= 0) {
    alert('jippy');
}

    indexOf() returns the position where the value is found. If there is no match it returns -1 so we need to check if the result is greater or equal to 0.

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