One of the most basic concepts in computer programming is the variable. You can think of a variable as a word or name that grasps a single value. For example, let’s say you needed the number 25 from our last example, but you’re not going to use it right away. You can set a variable, say
my_num, to grasp the value 25 and hang onto it for later use, like this:
my_num = 25
Declaring variables in Ruby is easy: you just write out a name like
= to assign it a value, and you’re done! If you need to change a variable, no sweat: just type it again and hit
= to assign it a new value.
Set the variable
my_num to the value
100, then click the Run button to run your code.