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I have this problem:

Write a simple interpreter which understands "+", "-", and "*" operations. Apply the operations in order using command/arg pairs starting with the initial value of value. If you encounter an unknown command, return -1. You are to ignore B.O.D.M.A.S completely.

Examples of the input and output
interpret(1, ["+"], [1]) → 2
interpret(4, ["-"], [2]) → 2
interpret(1, ["+", "*"], [1, 3]) → 6
interpret(5, ["+", "*", "-"], [4, 1, 3]) → 6

I have tried passing the parameters as multidimensional arrays below. I am trying to solve the problem such that when I do this

let operator = ["+", "-"];
let integer = 1;
let intArr = [1, 2];
let emptyInt;
let anotherInt;
let newArray = [integer, operator, intArr];

How do I make this work like above? Adding each of the array sequentially

you can do that using Array.prototype.reduce().ac to first value. And then add/minus/divide/multiply by by checking the operator.

function interpret(...args){
  let operators = args[1]; //get the operators array
  let values = args[2] //numbers expect the first one.
  return values.reduce((ac,val,i) =>{
    //check the operator at the 'i' on which we are on while iterating through 'value'
    if(operators[i] === '+') return ac + val;
    else if(operators[i] === '-') return ac - val;
    else if(operators[i] === '*') return ac * val;
    else if(operators[i] === '/') return ac / val;
    else return -1;
  },args[0]) //'ac' is initially set to first value.
}

console.log(interpret(1, ["+"], [1])) 
console.log(interpret(4, ["-"], [2])) 
console.log(interpret(1, ["+", "*"], [1, 3])) 
console.log(interpret(5, ["+", "*", "-"], [4, 1, 3]))

Operators, There are four different types of calculation operators: arithmetic, comparison, text concatenation, and reference. Arithmetic operators. To perform basic� Operators specify the type of calculation that you want to perform on the elements of a formula. Excel follows general mathematical rules for calculations, which is Parentheses, Exponents, Multiplication and Division, and Addition and Subtraction, or the acronym PEMDAS (Please Excuse My Dear Aunt Sally). Using parentheses allows you to change that calculation order. There are four different

You could use a recursive approach. Firstly, you can define an object to map your operators to useable functions, and then call a recursive function to calculate your result:

const oper = {
  '+': (a, b) => a + b,
  '-': (a, b) => a - b,
  '*': (a, b) => a * b,
  '/': (a, b) => a / b
};

const interpret = (n, [fc, ...calcs], [fn, ...nums]) =>
  fc === undefined ? n :
  interpret(oper[fc](n, fn), calcs, nums)

console.log(interpret(1, ["+"], [1])); // 2
console.log(interpret(4, ["-"], [2])); // 2
console.log(interpret(1, ["+", "*"], [1, 3])); // 6
console.log(interpret(5, ["+", "*", "-"], [4, 1, 3])); // 6

The order in which Excel performs operations in formulas, These are separated by calculation operators. Excel calculates the formula from left to right, according to a specific order for each operator in the formula. Operator� Operators specify the type of calculation that you want to perform on elements in a formula—such as addition, subtraction, multiplication, or division. In this article, you'll learn the default order in which operators act upon the elements in a calculation. You'll also learn that how to change this order by using parentheses.

You could take an object with the needed functions for the operators and redue the array by taking the value and an operand.

const
    fns = {
        '+': (a, b) => a + b,
        '-': (a, b) => a - b,
        '*': (a, b) => a * b,
        '/': (a, b) => a / b
    },
    interpret = (start, operators, values) =>
        values.reduce(
            (a, b, i) => operators[i] in fns
                ? fns[operators[i]](a, b)
                : - 1,
            start
        );

console.log(interpret(1, ["+"], [1])); // 2
console.log(interpret(4, ["-"], [2])); // 2
console.log(interpret(1, ["+", "*"], [1, 3])); // 6
console.log(interpret(5, ["+", "*", "-"], [4, 1, 3])); // 6

Java Arithmetic Operators, We can use arithmetic operators to perform calculations with values in programs. Arithmetic operators are used in mathematical expressions in� To calculate operator efficiency you will be needed standard minutes (SAM) of the garment and operations your operator is making. Use the following formula and calculate operator efficiency. Efficiency calculation formula: Efficiency (%) = (Total minute produced by an operator/Total minute attended by him *100) Where,

You can do this way:--

function getOperator(number, operator, integer) {
    let result;
    switch (operator) {
        case '+':
            result = number + integer;
            break;
        case '-':
            result = number - integer;
            break;
        case '*':
            result = number * integer;
            break;
        case '/':
            result = number / integer;
            break;
    }
    return result;
}
function doOperation(array) {
    number = array[0];
    for (let i = 0; i < array[1].length; i++) {
        number = getOperator(number, array[1][i], array[2][i]);
    }
    return number;
}

You can then use this to achieve asked :--

doOperation([1, ["+"], [1]])

SQL Arithmetic Operators, Arithmetic operators can perform arithmetical operations on numeric operands values against other values or perform arithmetic calculations. About Bitwise Calculator . The Bitwise Calculator is used to perform bitwise AND, bitwise OR, bitwise XOR (bitwise exclusive or) operations on two integers. It is also possible to perform bit shift operations on integral types.

Java Arithmetic Operators with Examples, Java too provides many types of operators which can be used according to the need to perform various calculation and functions be it logical, arithmetic,� This returns TRUE if there is text, so the NOT function reverses this to FALSE. And the IF performs its calculation. =IF(NOT(ISTEXT(B2)),B2*5%,0) Mastering logical functions will give you a big advantage as an Excel user. To be able to test and compare values in cells and perform different actions based on those results is very useful.

Evaluating arithmetic expressions, The middle String in the resulting array contains the operator, so we can use a we have all of the pieces we need to implement an expression calculator. simplify 1 x + 1 · x2 5 factor x2 − 5x + 6 factor 2x2 + 13x + 15 expand 3 (x + 6)

Formatting Calculations in Tableau, To create calculations, you need to understand the operators supported by Tableau. the basic operators that are available, as well as the order ( precedence) they are performed. Strings are recognized by single or double quotes. Bitwise operator works on bits and performs bit by bit operation. Assume if a = 60; and b = 13; Now in the binary format their values will be 0011 1100 and 0000 1101 respectively. Following table lists out the bitwise operators supported by Python language with an example each in those, we use the above two variables (a and b) as operands −

Comments
  • Good but how do i return -1 if there is an unidentified operator