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JavaScript - Constructs a new array whose elements are the difference between consecutive elements of the input array
Suppose, we have an array of numbers like this −
const arr = [3, 5, 5, 23, 3, 5, 6, 43, 23, 7];
We are required to write a function that takes in one such array and constructs another array whose elements are the difference between consecutive elements of the input array.
For this array, the output will be −
const output = [-2, 0, -18, 20, -2, -1, -37, 20, 16];
Example
Following is the code −
const arr = [3, 5, 5, 23, 3, 5, 6, 43, 23, 7];
const consecutiveDifference = arr => {
const res = [];
for(let i = 0; i < arr.length; i++){
if(arr[i + 1]){
res.push(arr[i] - arr[i+1]);
};
};
return res;
};
console.log(consecutiveDifference(arr));Output
Following is the output in the console −
[ -2, 0, -18, 20, -2, -1, -37, 20, 16 ]
Updated on: 15-Sep-2020
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