Booleans are the logical values true and false. In addition their literal forms, booleans are returned by equality and relational operators, as well as many built-in functions like math.comparable() and map.has-key().
You can work with booleans using boolean operators. The and operator returns true if both sides are true, and the or operator returns true if either side is true. The not operator returns the opposite of a single boolean value.
You can use booleans to choose whether or not to do various things in Sass. The @if rule evaluates a block of styles if its argument is true:
The if() function returns one value if its argument is true and another if its argument is false:
Anywhere true or false are allowed, you can use other values as well. The values false and null are falsey, which means Sass considers them to indicate falsehood and cause conditions to fail. Every other value is considered truthy, so Sass considers them to work like true and cause conditions to succeed.
For example, if you want to check if a string contains a space, you can just write string.index($string, " "). The string.index() function returns null if the string isn’t found and a number otherwise.
Some languages consider more values falsey than just false and null. Sass isn’t one of those languages! Empty strings, empty lists, and the number 0 are all truthy in Sass.
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