Ruby If Nil Then 0

There is a corresponding form of abbreviated assignment operator.

Ruby if nil then 0.

Notice ruby uses elsif not else if nor elif. Ruby of course isn t the only language that needs the concept of nothing far from it. In the first form if no arguments are sent the new array will be empty. Ruby supports a rich set of operators as you d expect from a modern language.

If the conditional is not true code specified in the else clause is executed. B is interpreted as a plus b where the plus. The values false and nil are false and everything else are true. Remember also that a ruby method returns nil by default.

Method in the object referred to by variable a is called with b as its argument. I m new to ruby and i was surprised when i found out that all objects are true apart from nil and false. And even those speaking ruby quite fluently don t usually know the tiny little details. September 11 2010 4 minute read tags.

If 0 is true then print 123. Even 0 is true. Then because conditional statements treat nil as false we can write. If you ve ever coded in php then you ve certainly had to deal with null and the same goes for c java and pretty much every mainstream modern programming language.

In ruby on rails what s the difference actually. Let s evaluate their usefulness and potential problems that they bring to the table. Everything else in ruby is considered true in a boolean context. Some languages consider the number 0 as a false value but that s not the case in ruby.

When a size and an optional default are sent an array is created with size copies of default take notice that all elements will reference the same object default. Executes code if the conditional is true. For each operator plus. An if expression s conditional is separated from code by the reserved word then a newline or a semicolon.

Railsの拡張 nil のいずれかでtrueを返す. Memoirs of a software team leader read more. Most operators are actually method calls. The second form creates a copy of the array passed as a parameter the array is generated by calling to ary on the parameter.

There are plenty of options available. If 0 puts 123 end 123 this is saying.