Ruby If Then One Line

Ruby has some amazing shorthands for if then else statements.

Ruby if then one line.

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. One equals sign in ruby means assignment make sure to use when you want to find out if two things are the same. A 5 a 7 if a 4 print a prints 5 since the if block isn t executed unless expression. These shorthands beautifully consolidate three or more lines of code into one readable line of code.

If a 4 then a 7 end or if a 4. 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. You could use the then keyword but its considered bad practice.

Yes else no end if item rigged yes else no end. An if expression s conditional is separated from code by the reserved word then a newline or a semicolon. Notice that we use two equal symbols to mean equality. Notice ruby uses elsif not else if nor elif.

In ruby the condition and the then part of an if expression must be separated by either an expression separator i e. I m getting into the habit of using these a lot more consistently so i wanted to share. With an if statement you can check if something is true. A 7 end note that the syntax for if one line blocks do not work anymore in ruby 1 9.

Executes code if the conditional is true. The unless expression is the opposite of the if expression the code. The github ruby styleguide recommends that one liners be reserved for trivial if else statements and that nested ternary operators be avoided. Or a newline or the then keyword.

So all of these would work.