Message from JavaScript discussions

December 2017

— You should apply map only on an array not directly on element of array.


From mozilla :
The map() method creates a new array with the results of calling a provided function on every element in the calling array.

— Check if[546] exists first

— Yeah, the thing is, I'm cycling all the elements of my array of objects and I want to store specific values into my array if a certain condition happens.

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— But now I'm thinking I could've just pushed them into an array of objects

var arr=[{}];

I think it could work.

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— Yeah, it does. :)

— If it did you wouldn't get the error

— Check if it exists in your code I mean

— Is there a more simple solution to this? Use case involves 2 functions, both accept any args (using rest operator) but one has to call the other func...

function someFunc(...args) {
// do something
function myFunc(...args) {
someFunc.apply(thisarg, args);

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— I get I can use rest operator again instead of apply too, but apply actually is needed here

— Example real code:

FORK_CHILD: function (bg = false, ...args) {
const pid =, bg, ...args);
return pid;

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— That was one of my first thoughts but they're part of the prototype