Javascript Array Concat and Join Method

 


The JavaScript Array concat() Method is used to merge two or more arrays together. This method does not alter the original arrays passed as arguments. but instead return new Array.

let newArray1 = oldArray.concat()
let newArray2 = oldArray.concat(value0)
let newArray3 = oldArray.concat(value0,value1)
.......
.......
let newArray = oldArray.concat(value1 , [ value2, [ ...,[ valueN]]])
--------------------------------
Description
The join() method returns an array as a string.
The join() method does not change the original array.
Any separator can be specified. The default is comma (,).



<!DOCTYPE html>

<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <h1>Javascript Array concat and join method</h1>

 <script>
  //Concat method
//  const arr1 = ["seema", "sharma"];
//  const arr2 = [1, 3,6];

//  const arr4 = [100, 20];

//  const arr3 =  arr1.concat(arr2, arr4);

// document.write(arr3+ "<br/>");

// const arr5 =  arr3.concat(500, 1000, "ADISMA");
//   document.write(arr5);


// Join method

  const arr1 = ["seema", "sharma"];

  const arrJoin = arr1.join("*");
  document.write(arrJoin)

 
 </script>


</body>
</html>

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