Ruby If Nil Then 0

Let s evaluate their usefulness and potential problems that they bring to the table.

Ruby if nil then 0.

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. For example a plus. Notice ruby uses elsif not else if nor elif. Method in the object referred to by variable a is called with b as its argument.

If 0 is true then print 123. For many beginning rubyists especially those having experience in other programming languages such as java or c checking whether variable is nil may seem a little bit confusing. 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.

Even 0 is true. There is a corresponding form of abbreviated assignment operator. September 11 2010 4 minute read tags. And even those speaking ruby quite fluently don t usually know the tiny little details.

An if expression s conditional is separated from code by the reserved word then a newline or a semicolon. Executes code if the conditional is true. Remember also that a ruby method returns nil by default. The second form creates a copy of the array passed as a parameter the array is generated by calling to ary on the parameter.

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. Returns a new array. In the first form if no arguments are sent the new array will be empty. In ruby on rails what s the difference actually.

Then because conditional statements treat nil as false we can write. For each operator plus. Ruby of course isn t the only language that needs the concept of nothing far from it. There are plenty of options available.

B is interpreted as a plus b where the plus. The values false and nil are false and everything else are true. I m new to ruby and i was surprised when i found out that all objects are true apart from nil and false. Most operators are actually method calls.

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.