คืน

Function returning a string literal via คืน \"ข้อความ\".

Aliases: return

Syntax: คืน <string-literal>

Category#

transfer

Related#

• →
• ⇥
• ดังนั้น
• โยน
• เงียบ

Examples#

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

Returns a value from a function.

# =============================================================================
# คืน — Returns a value from a function.
# =============================================================================
#
# What this teaches:
#   • Function return — `คืน <expression>` returns a value from a `ฟังก์ชัน`,
#     and bare `คืน` returns `เปล่า`
#   • Early returns with `ถ้า <cond> ดังนั้น คืน <expr>` for guard clauses
#
# Common mistakes:
#   • Using `คืน` outside a function body — `คืน` is only valid inside `ฟังก์ชัน` declarations (SEM032).
#
# See also: →, ⇥, ดังนั้น, โยน, เงียบ
# =============================================================================

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

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

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

fn duoetquadraginta() → int {
    return 42
}

fn tace() → void {
    # bare คืน for เปล่า 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 คืน จริง and คืน เท็จ.

# =============================================================================
# คืน — Functions returning boolean literals via คืน จริง and คืน เท็จ.
# =============================================================================
#
# What this teaches:
#   • Boolean return values — `คืน จริง` and `คืน เท็จ` are valid return
#     expressions for `ตรรกะ`-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 `ตรรกะ`, not a list.
#
# See also: จริง, เท็จ, ตรรกะ, ฟังก์ชัน
# =============================================================================

# scalar/return-bool — return boolean literals
#
# GRAMMAR:
#   returnStmt :← 'คืน' 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 คืน 42.

# =============================================================================
# คืน — Function returning an integer literal via คืน 42.
# =============================================================================
#
# What this teaches:
#   • Integer return values — `คืน 42` returns an integer literal from a
#     `จํานวน`-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 `จํานวน`, not a list.
#
# See also: เปล่า, ฟังก์ชัน
# =============================================================================

# scalar/return-integer — return integer literal
#
# GRAMMAR:
#   returnStmt :← 'คืน' 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)#

Function returning a string literal via คืน \"ข้อความ\".

# =============================================================================
# คืน — Function returning a string literal via คืน "ข้อความ".
# =============================================================================
#
# What this teaches:
#   • String return values — `คืน "ข้อความ"` returns a string literal from a
#     `ข้อความ`-typed function
#   • Verifies the backend handles string literal return types correctly
#
# Common mistakes:
#   • Confusing a scalar (single-value) return with a collection return — this function returns one `ข้อความ`, not a list.
#
# See also: ข้อความ, ฟังก์ชัน
# =============================================================================

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

fn da_textum() → string {
    return "textus"
}