Base Conversion

convert-base.ts

function base_10_to_base_n(v: number,b: number,r:number[]=[]): number[]{
	if(b==0) return;
    if (Math.floor(v) != v || Math.floor(b) != b) return;
    const div = Math.floor(v / b);
    const rem = v - div * b 
    r.push(rem);
    return div == 0 ? r.reverse() : base_10_to_base_n(div, b, r);
}
function base_n_to_base_10(val: number[], base: number) {
    if (base == 0) return;
    let sum = 0;
    for (let i = 0; i < val.length; i++){
        if (val[i] < 0 || val[i] > base)
            throw new Error(`val (${val[i]}) should be in range (0 to ${base})`);
       sum+=val[i]*Math.pow(base,(val.length-1-i)) //?
    }
    return sum;
}

function convert(val: number[]) {
    return {
    from: (base1: number) => {
            return {
                to: (base2: number): number[] => base_10_to_base_n(base_n_to_base_10(val,base1),base2)
            }
        }
    }
}

convert([12])
    .from(12)
    .to(10) //?