Arraysare not the only way to manage collections of variables in ruby.
Ruby define constant hash.
Ruby contains a wide range of predefined variables.
A constant is a type of variable which always starts with a capital letter.
If the constant is not found the callback const missing is not called and the method returns false.
One eins two zwei three drei.
In each of the checked classes or modules if the constant is not present but there is an autoload for it true is returned directly without autoloading.
Module admin autoload user admin user end admin.
So this gets problematic.
What is a constant in ruby.
It is similar to an array except that indexing is done via arbitrary keys of any.
Every predefined variable has its own specification.
Constants are used for values that aren t supposed to change but ruby doesn t prevent you from changing them.
Ruby constants constants begin with an uppercase letter.
A hash is like an array in that it s a variable that stores other variables.
Also called associative arrays they are similar to arrays but where an array uses integers as its index a hash allows you to use any object type.
This is how it looks.
Another type of collection of variables is the hash also called an associative array.
Constants may not be defined within methods.
You can think of the default default as nil if that makes any sense however default returns the default value rather than the new hash.
Hashes in ruby have a handy method called default that sets what the default looked up value should be when the key for the lookup is not found in the hash.
Employee salary.
In ruby you can create a hash by assigning a key to a value with separate these key value pairs with commas and enclose the whole thing with curly braces.
You can use predefine variables to perform a specific task like when dealing with interpreter parameters or regular expressions.
Constants defined within a class or module can be accessed from within that class or module and those defined outside a class or module can be accessed globally.
Ruby hashes a hash is a collection of key value pairs like this.
