JavaScript: Marge sort - recursion
JavaScript Function: Exercise-9 with Solution
Write a merge sort program in JavaScript.
Sample array : [34,7,23,32,5,62]
Sample output : [5, 7, 23, 32, 34, 62]
Pictorial Presentation:
Sample Solution:-
HTML Code:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Merge sort - recursion</title>
</head>
<body>
</body>
</html>
JavaScript Code:
Array.prototype.merge_Sort = function () {
if (this.length <= 1)
{
return this;
}
var half = parseInt(this.length / 2);
var left = this.slice(0, half).merge_Sort();
var right = this.slice(half, this.length).merge_Sort();
var merge = function (left, right)
{
var arry = [];
while (left.length > 0 && right.length > 0)
{
arry.push((left[0] <= right[0]) ? left.shift() : right.shift());
}
return arry.concat(left).concat(right);
};
return merge(left, right);
};
var a = [34,7,23,32,5,62];
console.log(a.merge_Sort());
Output:
[5,7,23,32,34,62]
Flowchart:
Live Demo:
See the Pen javascript-recursion-function-exercise-9 by w3resource (@w3resource) on CodePen.
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JavaScript: Tips of the Day
How to insert an item into an array at a specific index (JavaScript)?
What you want is the splice function on the native array object.
arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert). In this example we will create an array and add an element to it into index 2:
var arr = []; arr[0] = "Jani"; arr[1] = "Hege"; arr[2] = "Stale"; arr[3] = "Kai Jim"; arr[4] = "Borge"; console.log(arr.join()); arr.splice(2, 0, "Lene"); console.log(arr.join());
Ref: https://bit.ly/2BXbp04
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