type BinaryDigit = 0 | 1

export interface Bit {
    value: BinaryDigit
    add: (other: Bit) => { ones: Bit, carry: Bit },
    equals: (other: Bit) => boolean
}

export default function bit(value: BinaryDigit): Bit {

    function add(other: Bit) {
        const result = (value + other.value)
        const ones = result % 2 as BinaryDigit
        const carry = result === 2 ? 1 : 0

        return { ones: bit(ones), carry: bit(carry) }
    }

    function equals(other: Bit) {
        return value === other.value
    }

    return {
        add,
        value,
        equals
    }
}