Beginner Exercism • javascript

Binary

Challenge Overview

Convert a binary number, represented as a string (e.g. '101010'), to its decimal equivalent using first principles.

💡 View Solution

export class Binary {
  constructor(binary) {
    this.binary = binary;
  }

  toDecimal() {
    if (/[^01]/.test(this.binary)) return 0;
    return [...this.binary].reduce((acc, digit, index) => {
      return acc + Number(digit) * Math.pow(2, this.binary.length - 1 - index);
    }, 0);
  }
}