Talking about the definition of JS multidimensional array and hash array and using _javascript techniques

Multidimensional array definition

Defines an array object that is used to store a series of values in a separate variable name. Use the keyword new to create an array object.

One-dimensional array definition

var myarray=new Array (' A ', ' B ', ' C '); or var myarray = [];

Two-dimensional array and multidimensional array definition

JavaScript two-dimensional arrays or multidimensional arrays are modeled by one-dimensional arrays.

Method 1.

var arr= new Array ([' A ', ' B ', ' C '],[' d ', ' e ', ' f ']);

Method 2:

var arr=new  Array (

 new  Array (), new Array (), new array  ()  

);

Array Access:

arr[] [column];

Such as:

ARR[0][0]//A

Arr[1][0]//d

Hash array definition

JavaScript in the associative array, associative array because of the index of key value, so in the array lookup is more convenient, but also make the corresponding code algorithm to achieve a clearer, easy to read and easy to maintain.

var myhash = new Array ();

Add a key value to a hash associative array

myhash[' new ' = ' newval ';

myhash[' new2 '] = ' newval_2 ';

accessing hash associative arrays

myhash[' new ']; You can access it by following the key name

Delete hash array already has a key value delete myhash[' new '];

Traversal Hash Array

For (key in Myhash) {  
console.log (key);//key get key name  
Myhash[key];//Get Value
}

Common methods for JS array operation

ToString (): Converts an array to a string

toLocaleString (): Converts an array to a string

Join (): Converts an array into a symbolic concatenated string

Shift (): Moves an element of an array's head out

Unshift (): Inserts an element in the header of an array

Pop (): Deletes an element from the tail of an array

Push (): Adds an element to the tail of the array

Concat (): Adding elements to an array

Slice (): Returns the part of an array

Reverse (): Sort the array in reverse order

Sort (): Sorting operations on array

Splice (): Inserts, deletes, or replaces an array element

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