Pronounced "slam-da", stands for Short Lambda. A tiny library that enables lambda expressions for Haxe in a simple way.
Deprecation notice: With Haxe 4, this will be built into the language. Please use it instead!
Can be used with the common => syntax, but also in a shorter format where _ is assumed to be the first parameter. If more than one argument, use _1 and _2, etc.
// This line is all you need to enable the library:
using Slambda;
class Main {
static function main() {
var a : Dynamic;
// Short version, parameter name is set to "_"
a = [1, 2, 3].filter.fn(_ > 1);
trace(a); // [2, 3]
// Normal version, arrow syntax:
a = [1, 2, 3].filter.fn(x => x > 1);
trace(a); // [2, 3]
// For multiple arguments, use _1, _2, etc.
a = [1, 1, 1].mapi.fn(_1 + _2);
trace(a); // [1,2,3]
// Multiple arguments can also be used with arrow syntax,
// but must then use brackets:
a = [1, 1, 1].mapi.fn([i, a] => i + a);
trace(a); // [1,2,3]
// When used as a static extension, add rest arguments
// for functions like fold:
a = [1, 1, 1].fold.fn(_1 + _2, 10);
trace(a); // 13
// Chainable
a = [1, 2, 3].filter.fn(_ > 1).filter.fn(y => y > 2);
trace(a); // [3]
// Works inside (single-quoted) strings too
a = [1].map.fn('<b>$_</b>');
trace(a); // ["<b>1</b>"]
}
}If you import Slambda.fn, you can use it without the static extension:
import Slambda.fn;
// Only Lambda this time for the sake of the example.
using Lambda;
class Main {
static function main() {
var a = [1, 2, 3].filter(fn(_ > 1));
}
}haxelib install slambda, then use it in a hxml file with -lib slambda.