Spread Operator in ES6

spread.js

let doWork = function(x, y, z){
  return x + y + z; 
}

//using the ... syntax on an array we are able to pass in the params as follows:

nums = [1, 2, 3]

let result = doWork(...nums)
//which is the equivelent as 
let other_result = doWork(1,2,3); 

//spread can also be used to build arrays
//example 

let a = [1,3,5]
let b = [2,3, ...a,4]
console.log(b); //b is equal to [2,3,1,3,5,4]