redde

Translation status: Tiếng Việt reader-locale proof. Code fences render through the vi pipeline; prose is canonical Latin.

Function returning a string literal via redde \"textus\".

Aliases: return

Syntax: redde <string-literal>

Category#

transfer

Examples#

radix/corpus/redde/redde.fab (canonical · keyword)#

Returns a value from a function.

# =============================================================================
# redde — Returns a value from a function.
# =============================================================================
#
# What this teaches:
#   • Function return — `redde <expression>` returns a value from a `functio`,
#     and bare `redde` returns `vacuum`
#   • Early returns with `si <cond> ergo redde <expr>` for guard clauses
#
# Common mistakes:
#   • Using `redde` outside a function body — `redde` is only valid inside `functio` declarations (SEM032).
#
# See also: →, ⇥, ergo, iace, tacet
# =============================================================================

# redde statements (function return)
#
# redde <expression>   -- return a value
# redde                -- return void (vacuum)
#
# GRAMMAR:
#   returnStmt :← 'redde' expr?
#
# EXPECTED OUTPUT:
#   30, Salve, Munde, 42, 0, 20

fn adde(int a, int b) → int {
    return a + b
}

fn saluta(string nomen) → string {
    return "Salve, " + nomen
}

fn duoetquadraginta() → int {
    return 42
}

fn tace() → void {
    # bare redde for vacuum return type
    return
}

fn porta(int x) → int {
    if x < 0 {
        # early return on negative input
        return 0
    }
    return x * 2
}

main {
    print adde(10, 20)
    print saluta("Munde")
    print duoetquadraginta()
    tace()
    print porta(-5)
    print porta(10)
}

Expected output:

30
Salve, Munde
42
0
20

radix/corpus/scalar/return-bool.fab (canonical · keyword)#

Functions returning boolean literals via redde verum and redde falsum.

# =============================================================================
# redde — Functions returning boolean literals via redde verum and redde falsum.
# =============================================================================
#
# What this teaches:
#   • Boolean return values — `redde verum` and `redde falsum` are valid return
#     expressions for `bivalens`-typed functions
#   • Demonstrates that boolean literals pass through the return statement
#     unchanged
#
# Common mistakes:
#   • Confusing a scalar (single-value) return with a collection return — this function returns one `bivalens`, not a list.
#
# See also: verum, falsum, bivalens, functio
# =============================================================================

# scalar/return-bool — return boolean literals
#
# GRAMMAR:
#   returnStmt :← 'redde' expr
#
# Verifies that the Swift backend emits functions returning
# boolean literals (SC-001: primitives, functions, return).

fn da_verum() → bool {
    return true
}

fn da_falsum() → bool {
    return false
}

radix/corpus/scalar/return-integer.fab (canonical · keyword)#

Function returning an integer literal via redde 42.

# =============================================================================
# redde — Function returning an integer literal via redde 42.
# =============================================================================
#
# What this teaches:
#   • Integer return values — `redde 42` returns an integer literal from a
#     `numerus`-typed function
#   • Verifies the backend emits the correct primitive type for integer returns
#
# Common mistakes:
#   • Confusing a scalar (single-value) return with a collection return — this function returns one `numerus`, not a list.
#
# See also: vacuum, functio
# =============================================================================

# scalar/return-integer — return integer literal
#
# GRAMMAR:
#   returnStmt :← 'redde' expr
#
# Verifies that the Swift backend emits a function returning an
# integer literal (SC-001: primitives, functions, return).

fn da_numerum() → int {
    return 42
}

radix/corpus/scalar/return-string.fab (canonical · keyword)#