javascrip 30 天

真是一個夭壽的挑戰

Day	Topic	Problem	Status
1	Closure	Create Hello World Function	DONE
2	Closure	Counter	DONE
3	Closure	Counter II	DONE
4	Basic Array Transforms	Apply Transform Over Each Element in Array	DONE
5	Basic Array Transforms	Filter Elements from Array	DONE
6	Basic Array Transforms	Array Reduce Transformation	DONE
7	Function input and Output	Function Composition	DONE
8	Function input and Output	Allow One Function Call	DONE
9	Function input and Output	Memoize
10	Function input and Output	Curry
11	Promise	Sleep	DONE
12	Promise	Promise Time Limit
13	Promise	Promise Pool
14	Time (setTimeout)	Cache With Time Limit
15	Time (setTimeout)	Debounce
16	Time (setTimeout)	Throttle
17	JSON / Recursion / Important Utilities	JSON Deep Equal
18	JSON / Recursion / Important Utilities	Convert Object to JSON String
19	JSON / Recursion / Important Utilities	Array of Objects to Matrix
20	JSON / Recursion / Important Utilities	Differences Between Two Objects
21	JSON / Recursion / Important Utilities	Chunk Array
22	JSON / Recursion / Important Utilities	Flatten Deeply Nested Array
23	This	Array Prototype Last	DONE
24	This	Group By
25	This	Check if Object Instance of Class
26	This	Call Function with Custom Context
27	Classes	Event Emitter
28	Classes	Array Wrapper
29	Generators	Generate Fibonacci Sequence
30	Generators	Nested Array Generator

day-01

https://replit.com/@coreisdontgu/Create-Hello-World-Function#index.js

day-07

因為要反過來抓取 array 中的 function

var compose = function(functions) {
	return function(x) {
		if(functions.length === 0) return x
		let result = x
		for(let i = 0; i < functions.length; i++){
				result = functions.slice((i+1)*-1)[0](result)
		}
		return result
	}
};

但是也可以用另一種方式，直接透過 for loop 就可以從後面取回來。

return function(x) {
	let result = x;
	for (let i = functions.length - 1; i >= 0; i--) {
		result = functions[i](result);
	}
	return result;
}