Lodash映射键和对象上的值

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= {“a”：2，“b”：3}

但是有更好的Lodashy方式吗？

Answer 1

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

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

这样的事怎么样？

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reduce你可以做到：

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>

减少更为熟悉，但IMO变换似乎更合适