codility task

stack-machine.js

const MAX_VALUE = 1048575

const integerOperation = (integer) => (stack) => {
    stack.push(parseInt(integer))
}

const popOperation = (stack) => {
    stack.pop()
}

const dupOperation = (stack) => {
    if(stack.length < 0) {
        throw new Error('Invalid values')
    }
    const lastElement = stack.slice(-1)[0]
    integerOperation(lastElement)(stack)
}

const addOperation = (stack) => {
    if(stack.length <= 1){
        throw new Error('Invalid values')
    }
    const add = stack.slice(-2).reduce((a,b) => (a +b ))
    if(add > MAX_VALUE){
        throw new Error('Max value limit')
    }
    stack.splice(-2, 2)
    integerOperation(add)(stack)
}
const subtractOperation = (stack) => {
    if(stack.length <= 1) {
        throw new Error('Invalid values')
    }
    const subtract = stack.slice(-2).reduce((a, b) => (b - a))
    if(subtract < 0){
        throw new Error('Negative result from subtract')
    }
    stack.splice(-2, 2)
    integerOperation(subtract)(stack)
}

const operationsMap = {
    "+" : addOperation,
    "-" : subtractOperation,
    "DUP": dupOperation,
    "POP" : popOperation
}

const getOperation = value => {
    const operation = operationsMap[value]
    return operation ? operation : integerOperation(value)
}

function solution(S = "") {
    const stackResult = []
    const operationsCommands = S.split(" ")
    try{
        operationsCommands.forEach((command) => {
            const operationFunction = getOperation(command)
            operationFunction(stackResult)
        })
        return stackResult.pop()
    }
    catch (error) {
        return -1
    }
}