current position:Home>[front end -- interview] common interview questions (VII) -- detailed explanation of JS function coritization
[front end -- interview] common interview questions (VII) -- detailed explanation of JS function coritization
2021-08-27 08:21:07 【Hundred years of solitude】
This is my participation 8 The fourth of the yuegengwen challenge 19 God , Check out the activity details :8 Yuegengwen challenge
JS The function is coriolized
In computer science , currying ( English :
Currying
), Another translation isKarenization
orKalilization
, It is to transform a function that accepts multiple parameters into a single parameter ( First parameter of the original function ) Function of , And return the technique of taking the remaining arguments and returning the result of the new function . This technology was developed byChristopher · Strech
With logiciansHaskell · Gary
Named , Even though it isMoses Schönfinkel
andGottrob · Frege invented
.
Look at the word , It's very tall , The explanation looks as if you don't understand , But just look at the example .
Frequently asked questions : Realization add(1)(2)(3)(4)=10;
In daily life, we often see that the way of seeking peace is actually like this :add(1,2,3) = 6;
function add(x, y, z) {
return x + y + z;
}
console.log(add(1, 2, 3)); // 6
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There's another way to write it :
var add = function(x) {
return function(y) {
return function(z) {
return x + y + z;
}
}
}
var addOne = add(1);
var addOneAndTwo = addOne(2);
var addOneAndTwoAndThree = addOneAndTwo(3);
console.log(addOneAndTwoAndThree);
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Here we define a add
function , It takes a parameter and returns a new function . call add
after , The function returned is remembered by closure add
The first parameter of .
How to put it? , It seems that the function is realized , Just a little silly , Ha ha ha ha ~~
Of course we know ES6 You can change the code above :
const add = x => y => z => x + y + z;
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Then we use the concept of coritization to realize an automatic Coriolis function :
First of all, when we first implemented , First define an array to store all the parameters const _args = [...arguments];
;
Then declare a function inside , Using the properties of closures, save in _args
And collect all parameter values .
Then use toString Characteristics of implicit conversion , When the implicit conversion is finally performed , Calculate the final value and return .
function add() {
const _args = [...arguments];
function fn() {
_args.push(...arguments);
return fn;
}
fn.toString = function() {
return _args.reduce((sum, cur) => sum + cur);
}
return fn;
}
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In the interview , Because there is no actual project application , There is usually a topic similar to this , Let's take a test of our understanding of function coritization ;
Of course, we usually apply it to , Traditional function calls require all arguments to be determined in advance , If you get only part of the arguments in one place of the code , Get another part of the arguments in another place , At this time, corihua can use .
copyright notice
author[Hundred years of solitude],Please bring the original link to reprint, thank you.
https://en.qdmana.com/2021/08/20210827082104863v.html
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