scala从语法上供应了curried要领,如:
def add(x: Int, y: Int, z: Int) = x + y + z
val addCurried = (add _).curried
add(1, 2, 3) // => 6
addCurried(1)(2)(3) // => 6
val add2 = (x: Int, y: Int, z: Int) => x + y + z
val addCurried2 = add.curried
add(1, 2, 3) // => 6
addCurried(1)(2)(3) // => 6
scala 在函数式和面向对象以及二者的结合上都比javascript走的更远,而且语法上相称的精简。
然则js也太灵活了,许多特征都和模仿出来。
用javascript 对 curried 要领的完成:
代码链接:https://github.com/peichao01/test2/tree/master/javascript/curried
Function.prototype.curried = function(argsLength){
var self = this, len = argsLength === undefined ? self.length : argsLength;
if(len > 0){
function curried (time, stack){
return function(x){
stack[time] = x;
if(stack.length < len) {
return curried(time + 1, stack.concat());
} else {
return self.apply(self, stack);
}
}
}
return curried(0, []);
}
else{
return function(){
return self.apply(self);
}
}
};
var adder = function(x, y, z){ // 在 javascript 中运用函数定义,和将匿名函数赋值给变量基本上没有什么区别
return x + y + z
}
var t = function(){}
var p = function (a) {
return a + 1
}
// var a = adder.curried();
// var a1 = a(1)(2)(3);
var aa = adder.curried();
var aa1 = aa(1);
var aa2 = aa1(2);
var aa3 = aa2(3);
console.log(aa3);
console.log(aa1(-10)(23));
var ab2 = aa1(5);
var ab3 = ab2(6);
console.log(ab3);
console.log(aa(3)(5)(10));
console.log(aa(25)(50)(12));
console.log(aa1(-10)(23));
var t1 = t.curried();
var p1 = p.curried();
var p2 = p1(2);