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Array.prototype.flatMap() in JavaScript.
The JavaScript Array.prototype.flatMap() function flattens the given nested array into a new flat array.
Following is the code for the Array.prototype,flatMap() method −
Example
<!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 −
Updated on: 2020-07-16T08:45:19+05:30
147 Views
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