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JavaScript: Test string against each item in array

Posted on 2011-02-20
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Last Modified: 2012-05-11
I have a JavaScript array containing a list of blacklisted words.

I want to return true if a string contains any of the blacklisted words.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Demo</title>

<script type="text/javascript">
/*<![CDATA[*/

Array.prototype.contains = function(obj) {
  var i = this.length;
  while (i--) {
    if (this[i] === obj) {
      return true;
    }
  }
  return false;
}

var badStuff = new Array("aaa","bbb","ccc","ddd","eee");

var v = 'aaa hello world';
alert(badStuff.contains(v)); // should alert true because v contains aaa and aaa is in the baddStuff array

var v = 'This is a bbbbbbbb test';
alert(badStuff.contains(v)); // should alert true because v contains bbb and bbb is in the baddStuff array

var v = 'Hello World';
alert(badStuff.contains(v)); // should alert false

var v = 'ccc';
alert(badStuff.contains(v)); // should alert true

/*]]>*/
</script>

</head>
<body>

<h1>Hello World</h1>

</body>
</html>

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Question by:hankknight
1 Comment
 
LVL 16

Accepted Solution

by:
sjklein42 earned 2000 total points
ID: 34939158
You had a slight problem with the ===.  Use indexOf instead.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Demo</title>

<script type="text/javascript">
/*<![CDATA[*/

Array.prototype.contains = function(obj) {
  var i = this.length;
  while (i--) {
    if (obj.indexOf(this[i]) != (-1))
    {
      return true;
    }
  }
  return false;
}

var badStuff = new Array("aaa","bbb","ccc","ddd","eee");

var v = 'aaa hello world';
alert(badStuff.contains(v)); // should alert true because v contains aaa and aaa is in the baddStuff array

var v = 'This is a bbbbbbbb test';
alert(badStuff.contains(v)); // should alert true because v contains bbb and bbb is in the baddStuff array

var v = 'Hello World';
alert(badStuff.contains(v)); // should alert false

var v = 'ccc';
alert(badStuff.contains(v)); // should alert true

/*]]>*/
</script>

</head>
<body>

<h1>Hello World</h1>

</body>
</html>

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