Arrays

Arrays are collections of data.

Syntax

var passengers = ["Andres", "Paula","Carmenza","Jose"];
passengers[0];  // "Andres"
passengers[2] = "Carmencita";  // ["Andres", "Paula","Carmencita","Jose"]

pop()

This function will take out the last element of the array, continue with our array "passengers" we can do the next :

var lastPassanger = passengers.pop();
alert("The last Passenger is :"+lastPassenger+" !");  // "The last Passenger is : Jose !"
passengers;   //  ["Andres", "Paula","Carmencita"]

push()

This function will set the last element of the array, continue with our array "passengers" we can do the next :

passengers.push("Alejandro");
passengers;   //  ["Andres", "Paula","Carmencita", "Alejandro"]

map()

This function is useful in order to apply a certain operation for each of the elements of the array, returning an array with the result values.

Sample

var numbers = [1, 2, 3, 4, 5, 6];
var results = numbers.map(function (arrayCell) {
                            return arrayCell * 2;
                          }
);

console.log(results); // This will print the array : [2, 4, 6, 8, 10, 12]

shift()

This method returns the firts value of the array (from which it was called) and then it will resize the length of the array

    var fastPassQueue = ["Cedar Coaster", "Pines Plunge", "Birch Bumpers", "Pines Plunge"];
    var firstItem = fastPassQueue.shift(); // this will take out the first element of the array, and it will return it to the variable

    console.log("This is the first Item of the array : "+firstItem);

Content

Arrays can contain a lot of stuff

• Strings
• Values
• Variables
• Other arrays
• A combination of the last ones

var array = [1,2,3,4,5,6,7,8];
array[0] = undefined;

array;  // [undefined, 2, 3, 4,5,6,7,8]