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[英]What is the right way to use Ecmascript 6 arrow functions as methods in classes?
[英]What is the best way to sum arrays using ECMASCRIPT 6 Generator/Functions
有沒有更好的方法而不是使用生成器 function 作為閉包來增加 arrays 的值?
var sumArrays = function(){
var sum = 0;
return function*(){
while(true){
var array = yield sum;
if(array.__proto__.constructor === Array){
sum += array.reduce(function(val,val2){ return val+val2; });
}
else sum=0;
}
};
};
var gen = sumArrays();
// is this step required to make a generator or could it be done at least differently to spare yourself from doing this step?
gen = gen();
// sum some values of arrays up
console.log('sum: ',gen.next()); // Object { value=0, done=false}
console.log('sum: ',gen.next([1,2,3,4])); // Object { value=10, done=false}
console.log('sum: ',gen.next([6,7])); // Object { value=23, done=false}
// reset values
console.log('sum: ',gen.next(false)); // Object { value=0, done=false}
console.log('sum: ',gen.next([5])); // Object { value=5, done=false}
這似乎不是生成器應該解決的問題,所以我不會在這里使用生成器。
直接使用reduce
(ES5)似乎更合適:
let sum = [1,2,3,4].reduce((sum, x) => sum + x);
作為一個功能:
function sum(arr) {
return arr.reduce((sum, x) => sum + x);
}
如果你真的想在多個函數調用中求和多個數組,那么返回一個正常的函數:
function getArraySummation() {
let total = 0;
let reducer = (sum, x) => sum + x;
return arr => total + arr.reduce(reducer);
}
let sum = getArraySummation();
console.log('sum:', sum([1,2,3])); // sum: 6
console.log('sum:', sum([4,5,6])); // sum: 15
把事情簡單化。
這里使用for/of循環和箭頭function,
const sumArray = myArray => {
let sum = 0;
for(const value of myArray)
sum+= value;
return sum;
}
const myArray = [1, 2, 5];
console.log(sumArray(myArray));
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