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Sum all duplicate value in array - JavaScript
We are required to write a JavaScript function that takes in an array of numbers with duplicate entries and sums all the duplicate entries to one index
For example −
If the input array is −
const input = [1, 3, 1, 3, 5, 7, 5, 4];
Then the output should be −
const output = [2, 6, 7, 10, 4];
Example
Let’s write the code −
const input = [1, 3, 1, 3, 5, 7, 5, 3, 4];
const sumDuplicate = arr => {
const map = arr.reduce((acc, val) => {
if(acc.has(val)){
acc.set(val, acc.get(val) + 1);
}else{
return acc;
}, new Map());
}
return Array.from(map, el => el[0] * el[1]);
};
console.log(sumDuplicate(input));Output
Following is the output in the console −
[ 2, 9, 10, 7, 4 ]
Updated on 14-Sep-2020 13:48:49
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