javaScript - FUNCTIONS - Return II

FUNCTIONS

Return II

In the last exercise, we pointed out that using return makes programs more maintainable and flexible, but how exactly?

When functions return their value, we can use them together and inside one another. If our calculator needed to have a Celsius to Fahrenheit operation, we could write it with two functions like so:

const multiplyByNineFifths = (celsius) => {
  return celsius * (9/5);
};

const getFahrenheit = (celsius) => {
  return multiplyByNineFifths(celsius) + 32;
};

console.log('The temperature is ' + getFahrenheit(15) + '°F');
// Output: The temperature is 59°F

Take a look at the getFahrenheit() function. Inside of its block, we called multiplyByNineFifths() and passed it the degrees in celsius. The multiplyByNineFifths() function multiplied the celsius by (9/5). Then it returned its value so the getFahrenheit() function could continue on to add 32 to it.

Finally, on the last line, we interpolated the function call within a console.log()statement. This works because getFahrenheit() returns its value.

We can use functions to section off small bits of logic or tasks, then use them when we need to. Writing functions can help take large and difficult problems and break them into small and manageable problems.

1.

It's your job to calculate two more numbers for each order:

• A sales tax of 6% needs to be calculated for every full order. This should be based on the subtotal.
• The total, which is the subtotal plus tax, should also be computed.

Let's start with calculating the tax. Under the getSubTotal()function, create a function expression using the variable constnamed getTax. This function will take one parameter named itemCount.

Stuck? Get a hint

2.

Inside the getTax()function, call your getSubTotal() function and pass it the argument itemCount to get the subtotal, and then multiply the returned value by 6% (0.06). Make sure to return the result of this operation.

Stuck? Get a hint