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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:

JavaScript: Reverse the elements of a given array of integers length 3.

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:

Flowchart: JavaScript - Reverse the elements of a given array of integers length 3

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

Parameter's value

function getItems(fruitList, ...args, favoriteFruit) {
  return [...fruitList, ...args, favoriteFruit]
}

getItems(["banana", "apple"], "pear", "orange")

...args is a rest parameter. The rest parameter's value is an array containing all remaining arguments, and can only be the last parameter! In this example, the rest parameter was the second parameter. This is not possible, and will throw a syntax error.

function getItems(fruitList, favoriteFruit, ...args) {
  return [...fruitList, ...args, favoriteFruit];
}


getItems(['banana', 'apple'], 'pear', 'orange');
The above example works. This returns the array [ 'banana', 'apple', 'orange', 'pear' ].

Ref: https://bit.ly/3jFRBje