06. Equal Sums

function solve(input) {

    let index = 0;
    let isEqual = false;

    for(let i = 0; i < input.length; i++){
        let leftSum = input.slice(0, --i).reduce((a, b) => a + b, 0);
        let rightSum = input.slice(++i).reduce((a, b) => a + b, 0);
        if(leftSum === rightSum){
            index = --i;
            isEqual = true;
            break;
        }
    }
    console.log(input.length === 1 || isEqual ? index : "no");
}