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However, with an improved performance in most browsers, you might expect it to. Showing that the Compiler doesn't do anything about push statements in pre-compiled code. We observe the following output: for ( var a =, b = 0 b < 10 b ++ ) a. I put a function on the Array prototype called mypush, which carried out step 3 above. I also defined a fourth function to test. Other than that it's a simple assignment.Īrray = element - Similar to the previous, but this involves a lookup for situations where you don't have access to a pointer. The requirement of this method is that you must have a pointer to the last location.
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There are 3 distinct ways to do this:Īrray.push(element) - Defined on the native Array object, this is the method challenged by Google.Īrray = element - Assigning an element to a specific index of the array. I had always used push to assign a value to the end of an array, so thought I'd investigate this a little bit further to determine the performance of each of the methods. "Note that since assigning values to an array is faster than using push() you should use assignment where possible." I was recently reading Google's JavaScript Style Guide when I came across the following claim: