cheatsheets/js-array.md

title	layout
JavaScript arrays	default

JavaScript arrays

array = [a,b,c,d,e]

array[1]                 //=> b
array.indexOf(b)         //=> 1

Subsets

array.slice(1)           //=> [b,c,d,e]
array.slice(1,2)         //=> [b] 

// Destructive
re = array.splice(1)     // re = [b,c,d,e]     array == [a]
re = array.splice(1,2)   // re = [b,c]         array == [a,d,e]

Adding items

array.push(Z)            // array == [a,b,c,d,e,Z]
array.unshift(Z)         // array == [Z,a,b,c,d,e]

array.concat([F,G])      //=> [a,b,c,d,e,F,G]

Taking items

array.pop()              //=> e      array == [a,b,c,d]
array.shift()            //=> a      array == [b,c,d,e]