Javascript:flatten nexted array

 

Flatten nexted array without using flat

Code:

let numbers = [1, [2, [3, 4], 5]]

//console.log(numbers.flat(Infinity)) //uses flat

function flatten(arr,result=[]) {

    for (let item of arr) {

        console.log(item)

        if (Array.isArray(item)) {

            flatten(item,result)

        } else {

            result.push(item)

        }

    }

    return result

}

let flattened = flatten(numbers)

console.log(flattened)

Output:

[ 1, 2, 3, 4, 5 ]