JavaScript Array Methods

array.methods.js

// ARRAY METHODS //

// array.concat(item...)
var a = ['a', 'b', 'c'];
var b = ['x', 'y', 'z'];
var c = a.concat(b, true);
// c is ['a', 'b', 'c', 'x', 'y', 'z', true]

// array.join(separator)
var a = ['a', 'b', 'c'];
var b = a.join('');  // c is 'abc'

// array.reverse()
var a = ['a', 'b', 'c'];
var b = a.reverse();
// both a and b are ['c', 'b', 'a']


// array.push(item...)
var a = ['a', 'b', 'c'];
var b = ['x', 'y', 'z'];
var c = a.push(b, true);
// a is ['a', 'b', 'c', ['x', 'y', 'z'], true] & c is 5

// array.unshift(item...)
var a = ['a', 'b', 'c'];
var r = a.unshift('?', '@');
// a is ['?', '@' 'a', 'b', 'c'] & r is 5


// array.pop()
var a = ['a', 'b', 'c'];
var b = a.pop();  // a is ['a', 'b'] & b is 'c'

// array.shift()
var a = ['a', 'b', 'c'];
var b = a.shift();  // a is ['b', 'c'] & b is 'a'


// array.slice(start, end)
var a = ['a', 'b', 'c'];
var b = a.slice(0, 1);  // b is ['a']
var c = a.slice(1);  // c is ['b', 'c']
var d = a.slice(1, 2);  // d is ['b']

// array.splice(start, deleteCount, item...)
var a = ['a', 'b', 'c'];
var r = a.splice(1, 1, 'ache', 'bug');
// a is ['a', 'ache', 'bug', 'c'] & r is ['b']