Ruby If Then One Line

If the conditional is not true code specified in the else clause is executed.

Ruby if then one line.

An if expression s conditional is separated from code by the reserved word then a newline or a semicolon. One equals sign in ruby means assignment make sure to use when you want to find out if two things are the same. Ruby has some amazing shorthands for if then else statements. You could use the then keyword but its considered bad practice.

The unless expression is the opposite of the if expression the code. With an if statement you can check if something is true. If you don t this right you won t get the expected results. But when you want to check for the opposite not true false.

These shorthands beautifully consolidate three or more lines of code into one readable line of code. A 7 end note that the syntax for if one line blocks do not work anymore in ruby 1 9. Ternary statements still work this is equal to. The github ruby styleguide recommends that one liners be reserved for trivial if else statements and that nested ternary operators be avoided.

Notice ruby uses elsif not else if nor elif. So all of these would work. In ruby the condition and the then part of an if expression must be separated by either an expression separator i e. A 5 a 7 if a 4 print a prints 5 since the if block isn t executed unless expression.

Notice that we use two equal symbols to mean equality. Yes else no end if item rigged yes else no end. I m getting into the habit of using these a lot more consistently so i wanted to share. If foo then a elsif bar then b else c end you could use cases ruby s switch operator if find your control statements overly complex.

Executes code if the conditional is true.