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Adding up identical elements in JavaScript
We are required to write a JavaScript function that takes in an array of Numbers and sums all the identical numbers together at one index.
For example
If the input array is −
const arr = [20, 10, 15, 20, 15, 10];
Then the output should be −
const output = [40, 20, 30];
Therefore, let’s write the code for this function −
Example
The code for this will be −
const arr = [20, 10, 15, 20, 15, 10];
const addSimilar = arr => {
for(let i = 0; i < arr.length; i++){
while(i !== arr.lastIndexOf(arr[i])){
const ind = arr.lastIndexOf(arr[i]);
arr[i] += arr.splice(ind, 1)[0];
};
};
};
addSimilar(arr);
console.log(arr);Output
The output in the console will be −
[ 40, 20, 30 ]
Updated on: 21-Oct-2020
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