Wrapping my mind around spread operator

[admit8490]

It’s not so tricky like recursion for me, but this stuff is somewhat contrary to intuition.

For now ended up with this:
NOTE: it’s not a code, it’s kinda cheatsheet.

let someArray = [1, 2, 3]

//Why do i need spread operator?
//I need this stuff from the array for whatever reason, 
//but I don't need it's brackets


//Assumption:
//errors below have similar nature
//we are messing with OPERATORS
console.log(typeof(*))//error
console.log(typeof(...someArray))//error


//Analogy

//Math.sqrt does stuff with one operand, with Number
//spread operator does stuff with one operand, with Array

[ilenia]

The spread operator transform an array in a comma-separated list of it’s elements

if you do console.log(...someArray) it’s like you did console.log(1, 2, 3)

same in function arguments, copying array elements in an other array, and other things

[zyker.tompos]

The spread operator basically ‘spreads’ the elements inside it out of the list. I understand what it feels like to first understand the spread operator and this example helps me:

const array = [1, 2, 3];
const new_array = [0, ...array, 4, 5, 6];
console.log(new_array);

This example returns [0, 1, 2, 3, 4, 5, 6] and not [0, [1, 2, 3], 4, 5, 6]. I am still no expert myself, but this kind of helps me grasp it a little bit easier.

Hope this helps you a little bit more.