The first way described above does not do what it says it does. It actually creates an array of size 5 (all elements undefined), assigning it to the variable a, and then immediately throws that …

Enlightenment of the day - when you mention in part (A) that a newly created array using constructor syntax is not even iteratable. Javascript really surprises at times.

2478 I'm looking for any alternatives to the below for creating a JavaScript array containing 1 through to N where N is only known at runtime.

May 4, 2012 · 12 This answer is about "how to dynamically create an array without loop ". Literal operator [] doesn't allow us to create dynamically, so let's look into Array, it's constructor and …

Mar 3, 2012 · There is no Associative array in javascript. so if you name a index as named it will be converted as object so you can create like

Assuming a somewhat pedantic definition, it is technically impossible to create a 2d array in javascript. But you can create an array of arrays, which is tantamount to the same.

Jan 31, 2011 · 970 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 …

When optimizing for speed, you want to: create the array using literal syntax; set the length, initialize iterating variable, and iterate through the array using a while loop.

May 17, 2017 · The .apply method takes this array, and maps it into an arguments array (an array-like object) to be passed to the Array constructor function. The arguments array can't be …

Aug 5, 2009 · Is there a way to empty an array and if so possibly with .remove()? For instance, A = [1,2,3,4]; How can I empty that?