Toy Problem - PHP

Basic Programming

Objectives

1. Practice using higher order functions in PHP.

This exercise includes a few basic programming questions. Solve them in any order you like, but know that they more-or-less increase in difficulty.

Getting Started

Fork this repo and open it in your development environment (e.g. Cloud9, or on your computer if it's been set up for development). That's about it for setup.

Your work belongs in the files in the lib/ directory. To run a file, simply execute php path/to/file.php in a terminal. E.g. php lib/1_is_greater_than_five.php will run that file.

Do not change the name of the functions. Simply alter the body of the function to get the tests passing.

There is no bin/check script. You should write your own tests, as the examples indicate in the first exercise.

Problem Details

There are four programming problems in this set of exercises. Each is described below:

is_greater_than_five($num)

This function should return either true or false, depending on whether $num is greater than 5 or not.

You can safely assume that $num will always be some valid integer.

uppercases_all_letters($str)

This function should return a string of all capital letters--specifically it should convert $str into all-caps. So it the inputted $str is "dog", then this function would return "DOG".

You can safely assume that $str will always be some valid string.

add_up_numbers($arr)

This function should add up all of the numbers in $arr and return the sum. The inputted $arr will always be an array/list like [5, 10, 2]. With this example, the function would return 17.

filter_numbers($arr)

This function should return an array/list with all numbers 10 or greater removed. That is, it should go through $arr, which might be something like [30, 5, 9, 10, 11], and remove the numbers 10 or greater. In this case, it would return [5, 9].

You can safely assume $arr will always be some array/list of numbers.