CODEWITHSUNDEEP
javascript
Mori
Mori

Reputation: 6770

Empty values in if clauses

Here's a sample code:

<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<button onclick="myFunction();">Click!</button>
<script type="text/javascript">
function myFunction() {
var text = "";
if (text)
  {
  alert(text);
  }
else
  {
  alert("There's no text!");
  }
}
</script>
</body>
</html>

I wonder is there's a difference between if (text) and if (text != "")?

Thanks in advance!

Mike

Upvotes: 0

Views: 54

Answers (1)

Elliot Bonneville
Elliot Bonneville

Reputation: 53291

if(text) will evaluate to false if text is a null value, undefined value, 0, an empty string, or false. This is because the if statement is checking to see if text is a falsy value (e.g. null, undefined, 0, an empty string, or false).

if(text != "") checks to see if text does not equal an empty string. This means that the if statement will evaluate to true if text is a falsy value other than an empty string.

Upvotes: 1

Related Questions