September 2015
Beginner
110 pages
2h 6m
English
Content preview from Exercises for Programmers
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Chapter 5Functions
Our programs are getting complex. Even if we try to separate our input, processing, and output, as programs get more complex, it gets harder and harder to find things.
But we can use functions to organize our code, and we can even create reusable components.
Functions act like smaller programs inside our main program. Here’s some JavaScript code that defines a function that adds two numbers:
| | function addTwoNumbers(firstNumber, secondNumber) { |
| | return( |
| | firstNumber + secondNumber |
| | ); |
| | } |
The addTwoNumbers function takes in two numbers as its input, does the calculation, and returns the result to the rest of the program. Here’s how to use it:
| | var sum = addTwoNumbers(1,2); |
| | console.log(sum); |
Another benefit of functions ...
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