More condense way to combine same elements in array to one string in array?

Question

I'm trying to learn how to refactor my code, and I have written the following function block:

joinSame = (arr) =>{
    let simplifiedArr = [];
    for(let i=0; i < arr.length; i++){
        const tempLast = arr.lastIndexOf(arr[i]);
        const element = arr[i].toString()
        if(i === tempLast){
            simplifiedArr.push(element);
        } else {
            const tempMultiplier = tempLast-i+1;
            simplifiedArr.push(element.repeat(tempMultiplier));
            i = tempLast;
        }
    }
    return simplifiedArr;
}

The idea is that if I input a sorted array ([3,3,3,4,'a','a']), I want the output to be an array with similar entities combined into a string (['333', '4', 'aa']). I tried to use the .map and .forEach array method, but my problem is trying to "hop" the index to go to the next unique element.

Am I overcomplicating things by trying to get it to refactor to a .map or .forEach method, or is my code "good" enough to let it go?

Rajneesh · Accepted Answer · 2021-02-26 16:10:22Z

2

You can make use of reduce and then take Object.values:

const arr = [3,3,3,4,'a','a'];
const result = Object.values(arr.reduce((a,b)=>(a[b]=(a[b] || '')+b,a),{}))

console.log(result);

edited Feb 26, 2021 at 16:10

answered Feb 26, 2021 at 16:02

Rajneesh

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1 Comment

Persigio Over a year ago

Thank you! I thought the reduce method only gave one value for the output. Looks like I need to study that one more along with Object.values.

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