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Exercise 9

Identify all of the variables named on each line of the following code. You may assume that question is the name of a built-in function in JavaScript (it is not, so this code won't work as written).

function multiply(left, right) {
  let product = left * right;
  return product;
}

function getNumber(prompt) {
  return parseFloat(question(prompt));
}

let left = getNumber('Enter the first number: ');
let right = getNumber('Enter the second number: ');
console.log(`${left} * ${right} = ${multiply(left, right)}`);

Solution

Line 1: multiply, left, right: The function name and the parameter names are all variable names.
Line 2: product, left, right
Line 3: product
Line 6: getNumber, prompt
Line 7: parseFloat, question, prompt. This one is a little tricky. parseFloat is an actual built-in function in JavaScript; we are pretending that question also is a built-in function. As such, we know that both parseFloat and question are variable names.
Line 10: left, getNumber
Line 11: right, getNumber
Line 12: console, left, right, multiply: console.log is a little tricky here. console is the variable name for the built-in Console object. In contrast, console.log is the name of a method in that object. As such, log is a property name, not a variable name.

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