JavaScript: Swap pairs of adjacent digits of a given integer of even length
JavaScript Basic: Exercise-150 with Solution
Write a JavaScript program to swap pairs of adjacent digits of a given integer of even length.
Pictorial Presentation:
Sample Solution:
HTML Code:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>Swap pairs of adjacent digits of a given integer of even length.</title>
</head>
<body>
</body>
</html>
JavaScript Code:
function swap_adjacent_digits(n)
{
if (n.toString().length%2!=0)
{
return false;
}
var result = 0,
x = 1;
while (n != 0) {
var dg1 = n % 10,
dg2 = ((n - dg1) / 10) % 10;
result += x * (10 * dg1 + dg2);
n = Math.floor(n / 100);
x *= 100;
}
return result;
}
console.log(swap_adjacent_digits(15));
console.log(swap_adjacent_digits(1234));
console.log(swap_adjacent_digits(123456));
console.log(swap_adjacent_digits(12345));
Sample Output:
51 2143 214365 false
Flowchart:
ES6 Version:
function swap_adjacent_digits(n) {
if (n.toString().length % 2 != 0) {
return false;
}
var result = 0,
x = 1;
while (n != 0) {
var dg1 = n % 10,
dg2 = (n - dg1) / 10 % 10;
result += x * (10 * dg1 + dg2);
n = Math.floor(n / 100);
x *= 100;
}
return result;
}
console.log(swap_adjacent_digits(15));
console.log(swap_adjacent_digits(1234));
console.log(swap_adjacent_digits(123456));
console.log(swap_adjacent_digits(12345));
Live Demo:
See the Pen javascript-basic-exercise-150 by w3resource (@w3resource) on CodePen.
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Previous: Write a JavaScript program to change the capitalization of all letters in a given string.
Next: Javascript Functions Exercises.
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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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