In this JavaScript Array Properties we will learn about Javascript constructor , javascript length and javascript prototype.
Table of Contents
JavaScript constructor
JavaScript Array Properties — 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] }
JavaScript 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
JavaScript 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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