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I know there is a shorthand one-line if/else statement in Ruby:
a ? b : c Is there one for just a single if statement? Instead of writing this:
if a # do something end Is there a shorthand version of this?
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Ruby if...else Statement if expressions are used for conditional execution. The values false and nil are false, and everything else are true. Notice Ruby uses elsif, not else if nor elif. Executes code if the conditional is true.
In if statement, the block executes once the given condition is true, however in unless statement, the block of code executes once the given condition is false.
What you are seeing is the & operator applied to a :symbol . In a method argument list, the & operator takes its operand, converts it to a Proc object if it isn't already (by calling to_proc on it) and passes it to the method as if a block had been used.
In Ruby, we use a break statement to break the execution of the loop in the program. It is mostly used in while loop, where value is printed till the condition, is true, then break statement terminates the loop. In examples, break statement used with if statement. By using break statement the execution will be stopped.
You can use post conditions (don't mind the name, it will be evaluated before the code. And do_something will only be executed if condition evaluates to truthy value (i.e. not nil or false)).
do_something if a 
do_something if a This will first evaluate the if condition (in this case a) and if it is true (or in the case of a, not false or nil) it will execute do_something. If it is false (or nil) it will move on to the next line of code never running do_something.
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