If, Else, and Elseif

As the most common use of booleans, if blocks are a quick and easy way to check if a boolean expression is true.

Overview

If blocks run statements inside if a boolean expression is true. You begin by writing @if {condition}, and then put statements inside.

Example

$money = 300

start
  @if $money < 500
    You have less than $500.

@else

You can also specify statements to run if the condition is false. You do this by typing @else at the same level of indentation that your @if had, and putting statements inside it.

$money = 300

start
  @if $money < 500
    You have less than $500.
  @else
    You do not have less than $500.

Using nested @ifs with @else, you can do several @if clauses:

$money = 300

start
  @if $money < 500
    You have less than $500.
  @else
    @if $money < 1000
      You have less than $1000.
    @else
      @if $money < 2000
        You have less than $2000.
      @else
        You do not have less than $2000.

However, this can get a bit messy, so let’s learn about @elseif.

@elseif

@elseif is an alternative method to using nested @ifs. You use it similar to @if, but it must follow an @if or @elseif statement. You can always put @else after a group of @elseifs or one @elseif.

Here’s the example from above, written using @elseif:

$money = 300

start
  @if $money < 500
    You have less than $500.
  @elseif $money < 1000
    You have less than $1000.
  @elseif $money < 2000
    You have less than $2000.
  @else
    You do not have less than $2000.

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