Find length (size) of an array in JavaScript Asked 14 years, 8 months ago Modified 2 years, 9 months ago Viewed 348k times

May 25, 2017 · The OP was asking 'Array.size () vs Array.length'. From the previous discussions, it was make clear, that the 'size' Function is not part of standard JavaScript but implemented by libraries.

Jan 31, 2011 · 968 Most of the tutorials that I've read on arrays in JavaScript (including w3schools and devguru) suggest that you can initialize an array with a certain length by passing an integer to the …

Oct 2, 2015 · Is there any difference between checking an array's length as a truthy value vs checking that it's > 0? In other words is there any reason to use one of these statements over the other: var arr …

Mar 2, 2015 · This will sound a very silly question. How can we find the exact length of array in JavaScript; more precisely i want to find the total positions occupied in the array. I have a simple …

Mar 6, 2012 · 37 i'm doing some javascript coding and I was wondering if the length method is "precomputed", or remembered by the JS engine. So, the question is: If I'm checking really often for …

First one is like fake javascript array (which has property length). When Array.from gets a value of property length (5 in this case), then it creates a real array with length 5.

Jun 26, 2015 · That's because length gives you the next index available in the array. DOCS arrayLength If the only argument passed to the Array constructor is an integer between 0 and 2^32-1 (inclusive), …

What is the most efficient way to create an arbitrary length zero filled array in JavaScript?

Jun 25, 2014 · The related question how to ensure an array is created, which is distinct from this question, which asks how to tell if an array either doesn't exist or is empty.