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Call a function: Difference between revisions
Added Dyalect programming language
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(Added Dyalect programming language) |
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* Calling a function with a fixed number of arguments
<lang dragon>myMethod(97, 3.14)</lang>
=={{header|Dyalect}}==
Calling a function that requires no arguments:
<lang Dyalect>func foo() { }
foo()</lang>
Calling a function with a fixed number of arguments:
<lang Dyalect>func foo(x, y, z) { }
foo(1, 2, 3)</
Calling a function with optional arguments:
<lang Dyalect>func foo(x, y = 0, z = 1) { }
foo(1)</lang>
Calling a function with a variable number of arguments:
<lang Dyalect>func foo(args...) { }
foo(1, 2, 3)</lang>
Calling a function with named arguments:
<lang Dyalect>func foo(x, y, z) { }
foo(z: 3, x: 1, y: 2)</lang>
Using a function in statement context:
<lang Dyalect>func foo() { }
if true {
foo()
}</lang>
Using a function in first-class context within an expression:
<lang Dyalect>func foo() { }
var x = if foo() {
1
} else {
2
}</lang>
Obtaining the return value of a function:
<lang Dyalect>func foo(x) { x * 2 }
var x = 2
var y = foo(x)</lang>
Distinguishing built-in functions and user-defined functions:
<lang Dyalect>//Not possible in Dyalect at the moment</lang>
Distinguishing subroutines and functions:
<lang Dyalect>//There is no difference between subroutines and functions:
func foo() { } //doesn't explicitely return something (but in fact returns nil)
func bar(x) { return x * 2 } //explicitely returns value (keyword "return" can be omitted)</lang>
Stating whether arguments are passed by value or by reference:
<lang Dyalect>//All arguments are passed by reference</lang>
Is partial application possible and how:
<lang Dyalect>//Using a closure:
func apply(fun, fst) { snd => fun(fst, snd) }
//Usage:
func sum(x, y) { x + y }
var sum2 = apply(sum, 2)
var x = sum2(3) //x is 5
//By second argument
func flip(fun) { (y, x) => fun(x, y) }
func sub(x, y) { x - y }
var sub3 = apply(flip(sub), 3)
x = sub3(9) //x is 6</lang>
=={{header|Elena}}==
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