An if expression s conditional is separated from code by the reserved word then a newline or a semicolon.
Ruby if then else one line.
If var 10 print variable is 10 end.
If else if syntax.
First see a 10 the condition a 10 is comparing a with 10 and if a is greater than 10 then it is true and if smaller then false.
The simplest form of flow control and logic in ruby is called an if statement or technically speaking in ruby since everything is an expression an if.
Executes code if the conditional is true.
If construct in one line.
X 10 if x 8 puts x is greater than 8 end.
If you have an if else expression there is also a shorthand for that.
All in one line.
In the first line we are taking input.
Puts 123 end this is a shorthand version which can be useful if you have a simple condition.
If the conditional is not true code specified in the else clause is executed.
The values false and nil are false and everything else are true.
If a 10 here we used if.
You can also add an else expression.
I m getting into the habit of using these a lot more consistently so i wanted to share.
The ruby language has a very simple control structure that is easy to read and follow.
One of the most powerful features present in most programming and scripting languages is the ability to change the flow of the program as certain conditions change.
H ruby abc rb x is greater than 8.
Which is the same as.
It s possible to write an if statement using just one line of code.
H ruby abc rb x is greater than 8.
This chapter will cover all the basic i o functions available in ruby.
Puts 123 if 2 even.
Database applications advanced php programming perl python java programming javascript programming c c programming ruby programming visual basic view more.
The if then else statement in delphi code beginner delphi developers should watch out for if then else traps.
Is there an alternative.
All the i o methods are derived from the class io.
If var 10 print variable is 10 else print variable is something else end.
If the test expression evaluates to a true then the then expression is evaluated.
These shorthands beautifully consolidate three or more lines of code into one readable line of code.
Here s the key difference between ruby and most other languages.
The class io provides all the basic methods such as read write gets puts readline getc and printf.
Ruby provides a whole set of i o related methods implemented in the kernel module.
So the whole story is that if a 10 if a is greater than 10 then it will execute puts your number is greater than 10 otherwise it will execute puts your number not greater than 10 end at.
The then is optional.
