Funny challenge

//Challenge https://github.com/jesus-seijas-sp/hand-challenge
// Command: node script.js input.hand

let helloworld = "👉👆👆👆👆👆👆👆👆🤜👇👈👆👆👆👆👆👆👆👆👆👉🤛👈👊👉👉👆👉👇🤜👆🤛👆👆👉👆👆👉👆👆👆🤜👉🤜👇👉👆👆👆👈👈👆👆👆👉🤛👈👈🤛👉👇👇👇👇👇👊👉👇👉👆👆👆👊👊👆👆👆👊👉👇👊👈👈👆🤜👉🤜👆👉👆🤛👉👉🤛👈👇👇👇👇👇👇👇👇👇👇👇👇👇👇👊👉👉👊👆👆👆👊👇👇👇👇👇👇👊👇👇👇👇👇👇👇👇👊👉👆👊👉👆👊"

const fs = require('fs')

var input = Array.from(helloworld)

try {
    input = Array.from(fs.readFileSync(process.argv[2], 'utf8'))
} catch (err) {
    console.error(err)
}


const nextPointer = (input, state) => {
    if (input === "👉") {
        //console.log("👉 next cell")
        state.memory.push(0)
        state.index = state.index + 1
        return state
    }

    return state
}

const previousPointer = (input, state) => {
    if (input === "👈") {
        //console.log("👈 previous cell")
        state.index = state.index - 1
        return state
    }

    return state
}

const increment = (input, state) => {
    if (input === "👆") {
        //console.log("👆 increment")
        if(state.memory[state.index] === 255) {
            state.memory[state.index] = 0
        } else {
            state.memory[state.index] = state.memory[state.index] + 1
        }
        return state
    }

    return state
}

const decrement = (input, state) => {
    if (input === "👇") {
        //console.log("👇 decrement")
        if(state.memory[state.index] === 0) {
            state.memory[state.index] = 255
        } else {
            state.memory[state.index] = state.memory[state.index] - 1
        }
        return state
    }

    return state
}

const jump = (input, state) => {
    if (input === "🤜") {
        //console.log("🤜 Jump next")
        if (state.memory[state.index] === 0) {
            const newIndex = lookForJump(state.readerIndex+1, state.program, "🤛", "🤜")
            state.readerIndex = newIndex + 1
        }
        return state
    }

    return state
}

const jumpBack = (input, state) => {
    if (input === "🤛") {
        //console.log("🤛 Jump back")
        
        if (state.memory[state.index] !== 0) {
            const newIndex = lookForJumpBack(state.readerIndex-1, state.program, "🤜", "🤛")
            state.readerIndex = newIndex + 1
        }
        return state
    }

    return state
}

const print = (input, state) => {
    if (input === "👊") {
        //console.log("👊 print: ", String.fromCharCode(state.memory[state.index]))

        state.output.push(String.fromCharCode(state.memory[state.index]))
        state.memory = state.memory.slice(0, state.index + 1)
        
        return state
    }

    return state
}

const lookForJump = (index, input, element, skip) => {
    let nestedSkip = 0
    for (let i = index; i < input.length; i++) {
        const item = input[i]
        if(item === element) {
            if(nestedSkip > 0) {
                nestedSkip--
            } else {
                return i
            }
        }
        if(item === skip) {
            nestedSkip++
        }
    }

    return index
}

const lookForJumpBack = (index, input, element, skip) => {
    let nestedSkip = 0
    for (let i = index; i >= 0; i--) {
        const item = input[i]
        if(item === element) {
            if(nestedSkip > 0) {
                nestedSkip--
            } else {
                return i
            }
        }

        if(item === skip) {
            nestedSkip++
        }
    }

    return index
}

var state = {
    program: input,
    memory: [0],
    index: 0,
    readerIndex: 0,
    output: []
}
var commands = [
    nextPointer,
    previousPointer,
    increment,
    decrement,
    jump,
    jumpBack,
    print
]


while (state.readerIndex < input.length) {
    const element = input[state.readerIndex]
    const initReader = state.readerIndex

    state = commands.reduce((previous, current) => current(element, previous), state)

    if(initReader === state.readerIndex) {
        state.readerIndex = state.readerIndex + 1
    }
}

console.log()
console.log(state.output.join(""))