Lodash地图的键和值

Question

我的代码：

const orig = {" a ":1, " b ":2} 
let result = _.mapKeys(_.mapValues(orig, (v) => v + 1), (v, k) => k.trim()) 

实际和期望的结果= { “一”：2， “B”：3 }

但有一个更好的Lodashy这样做的方式？

Answer 1

该解决方案使用_.transform()，它有点短。我不确定它比你的功能性解决方案更好。

const orig = {" a ": 1, " b ": 2 }; 
 

 
const result = _.transform(orig, (r, v, k) => r[k.trim()] = v + 1); 
 

 
console.log(result);

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.4/lodash.min.js"></script>

Answer 2

怎么这样呢？

const orig = {" a ":1, " b ":2}; 
 

 
function test(object) { 
 
    let out = {}; 
 

 
    _.forEach(object, function(value, key) { 
 
    out[key.trim()] = value + 1; 
 
    }); 
 

 
    return out; 
 
} 
 

 
console.log(test(orig));

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.4/lodash.min.js"></script>

Answer 3

使用减少，你可以这样做：

var obj = {" a ":1, " b ":2} 
 

 
result = _.reduce(obj, (result, v, k) => { 
 
    result[k.trim()] = v + 1 
 
    return result 
 
}, {}) 
 

 
console.log(result)

<script src="https://cdn.jsdelivr.net/npm/lodash@latest/lodash.min.js"></script>

减少是比较熟悉的，但IMO变换似乎在这里更合适