Paul-Browne

// Heap's algorithm (iterative version, recursive version took waaaay longer)
// https://en.wikipedia.org/wiki/Heap%27s_algorithm

// Even though I kinda understand the algorithm, 
// *after* reading about it and converting it to JS
// I can't pretend that I came up with this solution on my own. 

const permutate = str => {	
	const lengthOfString = str.length;
	

Paul-Browne

//todo
var days = ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday"];
var daysCopy = days;

days.push("Saturday", "Sunday");
daysCopy[0] = "Lundi";

console.log(days);
// ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"]

Paul-Browne

var days = ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday"];
var daysCopy = days.slice();

days.push("Saturday", "Sunday");
daysCopy[0] = "Lundi";

console.log(days);
// ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"]

console.log(daysCopy);

Paul-Browne

var array = [1, 2, [3, 4], [5, 6, [7, 8], 9], 10];

var string = array.toString();

console.log(string);
// 1,2,3,4,5,6,7,8,9,10

Paul-Browne

var array = ["Monday", "Tuesday", "Wednesday"];

array.name = "Paul";
array.age = 35;

console.log(array);
// ["Monday", "Tuesday", "Wednesday", name: "Paul", age: 35]

console.log(array.length);
// 3

Paul-Browne

var days = ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"];

days.forEach( (element, index) => {
  console.log(element, index);
})

Paul-Browne

var days = ["Monday", "Tuesday", "Wednesday", "Thursday", "Saturday", "Sunday"];

if( days.indexOf("Wednesday") > -1 ){
  console.log("contains Wednesday!");
}

// same as
var containsWednesday = days.some(function(element){
  return element === "Wednesday";
});

Paul-Browne

var days = ["Monday", "Tuesday", "Wednesday", "Thursday", "Saturday", "Sunday"];
var removed = days.splice(4, 2, "Friday");

console.log(days);
// ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday"]

console.log(removed);
// [Saturday, Sunday]

Paul-Browne

var days = ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"];

var copy = days.slice();
var weekend = days.slice(5);
var alsoWeekend = days.slice(-2);
var weekdays = days.slice(0, 5);
var alsoWeekdays = days.slice(0, -2);

console.log(copy);
// ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"]