Problem051

var test = '1+2';
var numbersArr = test.split(/[+,\-,*,\/]+/);
var signsArr = test.split(/[0-9]*/);
signsArr = signsArr.filter(function(e){return e});

for(var i = 0; i < signsArr.length; i++){

    //check the 1st number
    if(i === 0 && ((signsArr[i] === '*') || (signsArr[i] === '/'))){

        if(signsArr[i] === '*'){
            numbersArr[i] = numbersArr[i] * numbersArr[i + 1];
        }
        if(signsArr[i] === '/') {
            numbersArr[i] = numbersArr[i] / numbersArr[i + 1];
        }

        numbersArr.splice(i + 1, 1);
        signsArr.splice(i, 1);
    }

    //check the mid numbers

    if((i > 0 && i < signsArr.length - 1) && (signsArr[i] === '/')){
        numbersArr[i] = numbersArr[i] / numbersArr[i + 1];
        numbersArr.splice( i + 1, 1 );
        signsArr.splice(i, 1);
    }

    if((i > 0 && i < signsArr.length - 1) && (signsArr[i] === '*')){
        numbersArr[i] = numbersArr[i] * numbersArr[i + 1];
        numbersArr.splice( i + 1, 1 );
        signsArr.splice(i, 1);
    }


    //check the last number
    if((i === signsArr.length - 1) && (signsArr[i] === '*' || signsArr[i] === '/')){
        if(signsArr[i] === '/'){
            numbersArr[numbersArr.length - 2] = numbersArr[numbersArr.length - 2] / numbersArr[numbersArr.length - 1];
        }
        if(signsArr[i] === '*'){
            numbersArr[numbersArr.length - 2] = numbersArr[numbersArr.length - 2] * numbersArr[numbersArr.length - 1];
        }

        numbersArr.splice(numbersArr.length - 1, 1);
        signsArr.splice(signsArr.length - 1, 1);
    }


}


var number = Number(numbersArr[0]);

for(var i = 0; i < signsArr.length; i++){

    if(signsArr[i] === '-'){
        number -= Number(numbersArr[i + 1]);
    }
    if(signsArr[i] === '+'){
        number += Number(numbersArr[i + 1]);
    }


}


console.log(test);
console.log(signsArr);
console.log(numbersArr);
console.log(number);