/*
	Spread Operator
*/

// Add the elements of an existing array into a new array

var certsToAdd = ['Algorithms and Data Structures', 'Front End Libraries'];
var certifications = [
	'Responsive Web Design',
	...certsToAdd,
	'Data Visualization',
	'APIs and Microservices',
	'Quality Assurance and Information Security'
];
console.log(certifications);

// Pass elements of an array as arguments to a function

function addThreeNumbers(x, y, z) {
	console.log(x+y+z)
}
var args = [0, 1, 2, 3];
addThreeNumbers(...args);

// Copy arrays

var arr = [1, 2, 3];
var arr2 = [...arr]; // like arr.slice()
arr2.push(4);
console.log(arr);
console.log(arr2);

// Concatenate arrays

var arr1 = [0, 1, 2];
var arr2 = [3, 4, 5];
//arr1.concat(arr2);
arr1 = [...arr1, "JavaScript", ...arr2];
console.log(arr1);

/*
	Rest Operator
*/

//Condense multiple elements into an array

function multiply(multiplier, ...theArgs) {
  //theArgs behave as Array so we can apply all Array methods
  //But it has to be the LAST(!) one specified, since it captures the rest of your arguments. 👏
  return theArgs.map(function(element) {
    return multiplier * element;
  });
}

var arr = multiply(2, 1, 2, 3);
console.log(arr)

// Delete duplicates & convert to arrayConvert to Array

let nums = [1, 2, 2, 3];

console.log([...new Set(nums)])