ES5 learning tutorial Array object, es5array object

ES5 learning tutorial Array object, es5array object

Preface

Many new things added in ES5 will help us write Javascript. The following describes the Array objects in ES5. Let's take a look at them.

1. syntax for creating an Array object:

new Array();new Array(size);new Array(element0, element1, ..., elementn)

Ii. Attributes

Attribute	Description
Constructor	Returns a reference to the array function that creates this object.
Length	Sets or returns the number of elements in the array.
Prototype	Allow adding attributes and methods to objects

Iii. Common Methods

Method	Description
Concat ()	Concatenate two or more arrays and return results
Join ()	Put all elements of the array into a string. Elements are separated by specified delimiters.
Pop ()	Delete and return the last element of the array
Push ()	Add one or more elements to the end of the array and return a new length.
Reverse ()	Reversing the order of elements in an array
Shift ()	Delete and return the first element of the array
Unshift ()	Add one or more elements to the beginning of the array and return a new length.
Slice ()	Returns the selected element from an existing array.
Sort ()	Sorts elements of an array.
Splice ()	Delete elements and add new elements to the array
ValueOf ()	Returns the original value of a string object.

Iv. Example

//concat()let a = [1,2,3]a.concat(4,5) //[1,2,3,4,5]//join()let a = [1,2,3]a.join() //1,2,3//slice()let a = [1,2,3]a.slice(1) //[2,3]let a = [1,2,3]a.slice(1,2) //[2]//splice()let a = [1,2,3,4,5]a.splice(1,1) //[2]let a = [1,2,3,4,5]a.splice(1,1,'hzzly') //[2]a //[1, "hzzly", 3, 4, 5]

Summary

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