binary to decimal

b2hfunc.ts

const b2h: (string) => string = (bin: string) => bin.split("")
    .reverse()
    .reduce((p, c, i, a) => {
        switch(i % 4 === 0) {
            case true:
                return p.concat(a.slice(i, i + 4).join(""));
            default:
                return p;
        }
    }, <string[]>[])
    .reverse()
    .map(v => v.split("")
            .reduce((p, c, i, a) => p + (+c * Math.pow(2, i)), 0)
            .toString(16))
    .join("")
    .toUpperCase();