Simple Tip: Parsing jQuery - Grep

In the latest episode of "Anatomy of jQuery," we'll lift the lid on $.grep and see exactly what's going on behind the scenes.

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grep jQuery source

// jQuery source for the grep method 
grep: function( elems, callback, inv ) {
		var ret = [];

		// Go through the array, only saving the items
		// that pass the validator function
		for ( var i = 0, length = elems.length; i < length; i++ ) {
			if ( !inv !== !callback( elems[ i ], i ) ) {
				ret.push( elems[ i ] );
			}
		}

		return ret;
	}

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Hopefully you now have a better understanding of what's going on behind the scenes. Remember: any time you need to remove items from an array, $.grep will do the job just fine!

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