Hmm, but what if we have 4 arithmetical operations in our calculator? Well, we can use an if - else if - else structure.

const number = 7;
if (number > 7) {
console.log('Our number is bigger then 7');
} else if (number < 7) {
console.log('Our number is smaller then 7');
} else {
console.log('Our number is equal to 7');
}
Tip:

We can use any number of ‘else if’ statements in a row. The first one that is true will be the only one that runs.

Challenge:

Let’s create 2 more functions and name them ‘divide’ and ‘multiply’.

Answer function divide(number1, number2) {
return number1 / number2
}

function multiply(number1, number2) {
return number1 * number2
}
Challenge:

Then let’s extend our ‘if else’ check that we have already created by adding

  • ‘else if’ operator is equal to - - call subtract function,
  • ‘else if’ operator is equal to / - call divide function,
  • ‘else if’ operator is equal to * - call multiply function
  • else console.log - “Sorry, we don’t know this operator”.
Answer const operator = "+"
const number1 = 10
const number2 = 6

if (operator === "+") {
console.log(add(number1, number2))
} else if (operator === "-") {
subtract(number1, number2)
} else if (operator === "/") {
divide(number1, number2)
} else if (operator === "*") {
multiply(number1, number2)
} else {
console.log("Sorry, we don't know this operator")
}
Go to Step 13