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Test if variable exists

/ Published in: JavaScript
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  1. var foo = "bar";
  2.  
  3. if ( typeof( window[ 'foo' ] ) != "undefined" ) {
  4.    document.write("foo is defined")
  5. } else {
  6.    document.write("foo is undefined")
  7. }

URL: http://www.rgagnon.com/jsdetails/js-0112.html

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