Question: What is else if in Ruby?

if expressions are used for conditional execution. The values false and nil are false, and everything else are true. … Executes code if the conditional is true. If the conditional is not true, code specified in the else clause is executed.

How do you write if else in Ruby?

The Ruby if else statement is used to test condition.

Syntax:

  1. if(condition1)
  2. //code to be executed if condition1is true.
  3. elsif (condition2)
  4. //code to be executed if condition2 is true.
  5. else (condition3)
  6. //code to be executed if condition3 is true.
  7. end.

What is IF statement in Ruby?

If statement in Ruby is used to decide whether a certain statement or block of statements will be executed or not i.e if a certain condition is true then a block of statement is executed otherwise not.

What is IF and ELSE IF?

Conditional Statements

Use if to specify a block of code to be executed, if a specified condition is true. Use else to specify a block of code to be executed, if the same condition is false. Use else if to specify a new condition to test, if the first condition is false.

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What is the difference between if and unless statement in Ruby?

Ruby provides a special statement which is referred as unless statement. This statement is executed when the given condition is false. … 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 is return in Ruby?

Explicit return

Ruby provides a keyword that allows the developer to explicitly stop the execution flow of a method and return a specific value. … The return keyword returns nil if no value is passed as argument.

How do you break in Ruby?

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.

Can you have an if statement inside an if statement Ruby?

If you were following Ruby conventions you wouldn’t face this problem. You can simplify reading it by assigning your “if-in-if” condition results into variables.

How do you compare strings in Ruby?

eql? is a String class method in Ruby which is used to check whether the strings are equal or not if they have the same length and content. Parameters: Here, str and other_str are the strings. Returns: True or false basis on the equality.

What is question mark in Ruby?

It is a code style convention; it indicates that a method returns a boolean value (true or false) or an object to indicate a true value (or “truthy” value). The question mark is a valid character at the end of a method name. https://docs.ruby-lang.org/en/2.0.0/syntax/methods_rdoc.html#label-Method+Names.

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Can you have 3 conditions in an if statement?

If you have to write an IF statement with 3 outcomes, then you only need to use one nested IF function. The first IF statement will handle the first outcome, while the second one will return the second and the third possible outcomes. Note: If you have Office 365 installed, then you can also use the new IFS function.

What is the structure of if else if?

The if/else if statement allows you to create a chain of if statements. The if statements are evaluated in order until one of the if expressions is true or the end of the if/else if chain is reached. If the end of the if/else if chain is reached without a true expression, no code blocks are executed.

What is nested IF?

Nested IF functions, meaning one IF function inside of another, allows you to test multiple criteria and increases the number of possible outcomes. … We use additional nested IF functions to test for C, D, and F grades.

Is unless the same as if not?

Often when we are talking about present situations, we use unless instead of if…not. Unless means except if or simply it means if…not. Both of these examples have the same meaning and refer to the present time. “You can’t go on vacation unless you save some money.”

Should I use unless Ruby?

A good use for unless is when you want to check something at the beginning of a method. Also known as a guard clause. return unless name.

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What is guard clause in Ruby?

TLDR; a guard clause is a premature return (early exit) that “guards” against the rest of your code from executing if it’s not necessary (based on criteria you specify). Soon after I started my career as a Ruby on Rails developer I learned about guard clauses and how they can improve code readability.