array.flatmap() method in JavaScript.

JavascriptWeb DevelopmentObject Oriented Programming

The JavaScript array.flatMap() function flattens the given nested array into a new flat array.

Following is the code for the array.flatMap() method −

Example

 Live Demo

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
<style>
   body {
      font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
   }
   .sample {
      font-size: 20px;
      font-weight: 500;
   }
</style>
</head>
<body>
<h1>JavaScript Array flatMap()</h1>
<div class="sample"></div>
<button class="Btn">CLICK HERE</button>
<h3>
Click on the above button to convert the nested array to flat array
</h3>
<script>
   let fillEle = document.querySelector(".sample");
   let arr = ["cow", ["bull", "lion", "tiger"], "sheep"];
   for (x of arr.entries()) {
      fillEle.innerHTML += x + "<br>";
   }
   var entries = arr.entries();
   document.querySelector(".Btn").addEventListener("click", () => {
      arr = arr.flatMap((x) => x);
      fillEle.innerHTML = "";
      for (x of arr.entries()) {
         fillEle.innerHTML += x + "<br>";
      }
   });
</script>
</body>
</html>

Output

The above code will produce the following output −

On clicking the “CLICK HERE” button −

raja
Published on 16-Jul-2020 12:00:04
Advertisements