ES6将两个数组合并成一个对象数组

需求

有这么两个数组

 let metrodates = [
  "2008-01",
  "2008-02",
  "2008-03",..ect
 ];
 let figures = [
  0,
  0.555,
  0.293,..ect
 ]

想要这样的结果

 let result = [
    {data: 0, date: "2008-01"},
    {data: 0.555, date: "2008-02"},
    {data: 0.293, date: "2008-03"},..ect
 ];

方案一

 let result = [];
 for(let index in metrodates){
     result.push({data: figures[index], date: metrodates[index]});
 }

此方案为最原始方法，简单，但过于low

方案二

 let result = metrodates.map((date,i) => ({date, data: figures[i]}));

此方案使用了ES6中的map，简洁，但本质还是遍历，显得有些low

方案三

 const zip = ([x,...xs], [y,...ys]) => {
   if (x === undefined || y === undefined)
     return [];
   else
     return [[x,y], ...zip(xs, ys)];
 }
 let result = zip(metrodates, figures).map(([date, data]) => ({date, data}));

此方案使用了ES6+递归，显得高大上起来了。

方案四

 const isEmpty = xs => xs.length === 0;
 const head = ([x,...xs]) => x;
 const tail = ([x,...xs]) => xs;
 const map = (f, ...xxs) => {
   let loop = (acc, xxs) => {
     if (xxs.some(isEmpty))
       return acc;
     else
       return loop([...acc, f(...xxs.map(head))], xxs.map(tail));
   };
   return loop([], xxs);
 }
 let result = map((date, data) => ({date, data}), metrodates, figures);

此方案是方案三的加强版，它能接受多个数组映射成对象数组，威力无比！