Let’s say, we are required to write a JavaScript function that takes in an array and a number n and rotates the array by n elements
For example: If the input array is −
const arr = [12, 6, 43, 5, 7, 2, 5];
and number n is 3,
Then the output should be −
const output = [5, 7, 2, 5, 12, 6, 43];
Let’s write the code for this function −
Example
Following is the code −
// rotation
const arr = [12, 6, 43, 5, 7, 2, 5];
const rotateByOne = arr => {
for(let i = 0; i < arr.length-1; i++){
temp = arr[i];
arr[i] = arr[i+1];
arr[i+1] = temp;
};
}
Array.prototype.rotateBy = function(n){
const { length: l } = this;
if(n >= l){
return;
};
for(let i = 0; i < n; i++){
rotateByOne(this);
};
};
const a = [1,2,3,4,5,6,7];
a.rotateBy(2);
console.log(a);Output
Following is the output in the console −
[ 3, 4, 5, 6, 7, 1, 2 ]