Which of the following keywords would you use to assign a variable that cannot be changed by the program once it is defined in javascript? code example

Example 1: js variable

var Number = 5;
var String = "Hi!";
var boolen1 = true;
var boolen2 = false;
var array = [11, "Hi!", true];
var object = {age:11, speach:"Hi!", likes_Bananas:true};

Example 2: Create variable javascript

//Assigns the value bar to the variable foo
var foo = bar;