Let

The .let function defines a temporary variable that is accessible only within its scope. It accepts two parameters:

1. The value, of any type, to assign to the scoped variable
2. A lambda block that accepts one parameter (the given value)

.let {.multiply {4} {2}}
    area:
    The area of the rectangle is .area.
    If it were a triangle, it would have been .divide {.area} by:{2}.

The function returns the evaluation of the lambda, so you can use it as an expression.

.center
    .let {Quarkdown}
        name:
        .uppercase {.name}, .lowercase {.name}, .capitalize {.name}

The lambda block also accepts implicit positional parameters. See Lambda for more information.

.center
    .let {Quarkdown}
        .uppercase {.1}, .lowercase {.1}, .capitalize {.1}