Learn how you can use JavaScript spread operator on arrays and objects

JavaScript spread operator (...) is used to expand the values of an iterable ( usually an array or an object) so that you can pass those values as arguments of a function. For example, let’s say you have a function that calculates the sum of three numbers:

function sumThree(a, b, c){
  return a+b+c;
}

Next, you want to pass an array of three numbers into the function. You can use the spread operator on the function:

let scores = [7, 9, 7];

let summedNumber = sumThree(...scores);
// The same as sumThree(7, 9, 7); 

console.log(summedNumber);
// output is 23

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