JavaScript: Reverse the elements of a given array of integers length 3
JavaScript Basic: Exercise-73 with Solution
Write a JavaScript program to reverse the elements of a given array of integers length 3.
Pictorial Presentation:
Sample Solution:
HTML Code:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>JavaScript program to reverse the elements of a given array of integers length 3.</title>
</head>
<body>
</body>
</html>
JavaScript Code:
function reverse3(array) {
return array.map((element, idx, arr) => arr[(arr.length - 1) - idx]);
}
console.log(reverse3([5, 4, 3]));
console.log(reverse3([1, 0, -1]));
console.log(reverse3([2, 3, 1]));
Sample Output:
[3,4,5] [-1,0,1] [1,3,2]
Flowchart:
ES6 Version:
function reverse3(array) {
return array.map((element, idx, arr) => arr[(arr.length - 1) - idx]);
}
console.log(reverse3([5, 4, 3]));
console.log(reverse3([1, 0, -1]));
console.log(reverse3([2, 3, 1]));
Live Demo:
See the Pen JavaScript - Reverse the elements of a given array of integers length 3 - basic-ex-73 by w3resource (@w3resource) on CodePen.
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Previous: Write a JavaScript program to check if the first and last elements are equal of a given array of integers length 3.
Next: Write a JavaScript program to find the larger value between the first or last and set all the other elements with that value.
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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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