How to use the concat() method

The concat() method in JavaScript can be used to concatenate two or more arrays to create a new array, and can also be used to concatenate strings.

##JavaScript concat() method

Function: is used to connect two One or more arrays (strings), this method does not change existing arrays or strings.

Syntax:

Object.concat(value1,value2,......,valueX)

Parameter valueX: It can be any number of specific values, array objects, or string objects.

Note: When connecting two or more arrays (strings), all valueX parameter values ​​will be added to the end of Object and the new connected array (string) will be returned. ).

JavaScript concat() method usage example

##Example 1: Connect multiple arrays

<script type="text/javascript">
var arr = new Array(3)
arr= ["George","John","Thomas"];
var arr2 = new Array(3);
arr2=["James","Adrew","Martin"];
var arr3 = new Array(2)
arr3 = ["William","Franklin"]
console.log(arr.concat(arr2,arr3));
console.log(arr);
</script>

Rendering:

<script type="text/javascript">
var arr = new Array(3)
arr= [1,7,3];
var arr2 = new Array(3);
arr2=[2,3,5];
var arr3 = new Array(2)
arr3 = [4,5,6]
console.log(arr.concat(arr2,arr3));
console.log(arr);
</script>

Rendering:

Example 2: Multiple connections A string

<script type="text/javascript">
var arr = "dsfjh";
var arr2 = "PHP";
var arr3 = "中文网！"
console.log(arr.concat(arr2,arr3));
console.log(arr);
</script>

Rendering:

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