JavaScript Array Properties

JavaScript Array Properties

Table of Contents

constructor

In JavaScript, the constructor property returns the constructor function for an object. For JavaScript arrays the constructor property returns function Array() { [native code] }

var fruits = ['Banana', 'Orange' ,'Apple']; fruits.constructor ; //Returns // function Array() { [native code] }

length

The length property sets or returns the number of elements in an array.

var fruits = ['Banana', 'Orange' ,'Apple']; fruits.length ; //Returns 3 var vegetables = []; vegetables.length = 3; // function Array length to 3

prototype

The prototype constructor allows you to add new properties and methods to the Array() object.

//Make a new array method Array.prototype.myUcase = function(){ for (i=0; i < this.length;i++){ this[i] = this[i].toUpperCase(); } } // Make an array, then call the myUcase method: var fruits = ['Banana', 'Orange' ,'Apple']; fruits.myUcase();

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