Basic Array Examples

by akmiecik

JavaScript

//---------------------------------------
//Examples: Arrays

//push, pop, shift, unshift, splice, reverse, sort, concat, slice, indexOf

//---------------------------------------
//'push' adds items to the end of an array
var arr = [];

arr.push('a');
arr.push('b');
arr.push('c');
arr.push('d');

write('array.push(val) => ' + arr);

//---------------------------------------
//'pop' removes items off the end of an array

arr.pop();

write('array.pop() => ' + arr);

//---------------------------------------
//'shift' removes items off the beginning of an array

arr.shift();

write('array.shift() => ' + arr);

//---------------------------------------
//ushift adds items to the beginning of an array

arr = []; //reset array

arr.unshift('a');
arr.unshift('b');
arr.unshift('c');

write('array.unshift(val) => ' + arr);

//---------------------------------------
//shift takes items off the beginning

arr.shift('a');

write('array.shift(val) =>' + arr);

//---------------------------------------
//reversing the array

arr.unshift('c');

arr.reverse();

write('array.reverse() => ' + arr);

arr.reverse();

write('array.reverse() => ' + arr);

//---------------------------------------
//splicing inserts values into an array at a given position

arr.splice(3, 'd');

//---------------------------------------
//sorts an array lexicographically (in dictionary order)

arr.sort();

write('array.sort() => ' + arr); 

//---------------------------------------
//concatenates values or arrays

arr2 = [1,2,3];

arr = arr.concat(arr2);

write('array.concat(val) => ' + arr);

//---------------------------------------
//slice elements to create a new array

arr = arr.slice(0,3); //index1, index2

write('array.slice(begin,end) => ' + arr);

//---------------------------------------
//get index of a certain value in array

var index = arr.indexOf('c');

write('array.indexOf(\'c\') => ' + index);


//---------------------------------------
//print to document helper function

function...