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yeahnah.js

#!/usr/bin/env node

const uintToBitString = int => {
    if (!(int >= 0 && int <= 127)) throw Error('ASCII only, hun.')
    let bitString = ''
    function f(num){
        if (num == 0) return
        let rem = num % 2
        let div = Math.floor(num / 2)
        f(div)
        bitString += rem.toString() // Because this happens after the stack has fully extended, the string will be appended to in reverse order.
    }
    f(int)
    return bitString
}

const leftPad8 = bitString => '0'.repeat(8 - bitString.length) + bitString

let input = process.argv[2]
if (!input) throw Error('Huh?')

let ascii = ''
for (let i = 0; i < input.length; i += 1){
    let charCodeInt = input.codePointAt(i)
    let bitString = leftPad8(uintToBitString(charCodeInt))
    ascii += bitString
}

let translated = ascii.replace(/1/g,'yeah, ').replace(/0/g, 'nah, ')

// Grammar
translated = translated.replace(/^y/, 'Y').replace(/^n/, 'N').substring(0, translated.length - 2) + '.'

process.stdout.write(translated)