Ruby if else for beginners and professionals with examples on oops regex string array hashes methods blocks modules ranges files directories database.
Ruby set variable if else.
If the conditional is not true code specified in the else clause is executed.
If var 10 print variable is 10 else print variable is something else end.
Instance variable defined food but you don t want to use any of that.
Instance variables are available across methods for any specified instance or object i e.
But when you want to check for the opposite not true false.
One equals sign in ruby means assignment make sure to use when you want to find out if two things are the same.
Instance variables begin with commat.
The set statement may appear anywhere within the body of a script.
An instance variable name always starts with a sign.
The following example sets the variable x to have the value 5.
Local variables include orange for instance variables.
Notice that we use two equal symbols to mean equality.
Instance variables can change from object to object.
Sets a variable to have the value of the provided expression or sets multiple variables at the same time based on the result of multiple expressions.
Set x 5.
One of the most common novice mistakes with if else is thinking that multiple if statements are equivalent to using elsif and else.
Executes code if the conditional is true.
If else if syntax.
In 99 of the cases if a local variable is missing you have a typo or someone forgot to declare that variable.
Ruby has other ways to check if a variable has been defined or not.
Global variable in class1 is 10 global variable in class2 is 10 ruby instance variables.
Think of if as creating a two pronged fork in the road.
The script has the option of taking or avoiding that side path created by the if if it does go the if when the script reaches the end it continues on linearly until the next fork.
Here is an example showing the usage of instance variables.
Here s the key difference between ruby and most other languages.
Notice ruby uses elsif not else if nor elif.
With an if statement you can check if something is true.
If you don t this right you won t get the expected results.
They are similar to class variables but their values are local to specific instances of an object.
