How to filter keys of an object with lodash

Question

I have an object with some keys  and I want to only keep some of the keys with their value   I tried with filter    x000D   x000D  const data     x000D    aaa  111  x000D    abb  222  x000D    bbb  333 x000D     x000D   x000D  const result     filter data   value  key    gt  key startsWith  a     x000D   x000D  console log result   x000D   lt script src  https   cdnjs cloudflare com ajax libs lodash js 4 17 15 lodash min js  gt  lt  script gt  x000D   x000D   x000D    But it prints an array       111  222    Which is not what I want    How to do it with lodash  Or something else if lodash is not working

User · Accepted Answer

Lodash has a   pickBy function which does exactly what you re looking for    x000D   x000D  var thing     x000D     a   123  x000D     b   456  x000D     abc   6789 x000D     x000D   x000D  var result     pickBy thing  function value  key    x000D    return   startsWith key   a    x000D      x000D   x000D  console log result abc     6789 x000D  console log result b       undefined x000D   lt script src  https   cdn jsdelivr net lodash 4 16 4 lodash min js  gt  lt  script gt  x000D   x000D   x000D

User · Answer

Native ES2019 one-liner  x000D   x000D  const data       aaa  111    abb  222    bbb  333     const filteredByKey   Object fromEntries Object entries data  filter   key  value     gt  key startsWith  a      console log filteredByKey   x000D   x000D   x000D

User · Answer

A non-lodash way to solve this in a fairly readable and efficient manner    x000D   x000D  function filterByKeys obj  keys         x000D    const filtered      x000D    keys forEach key   gt    x000D      if  obj hasOwnProperty key     x000D        filtered key    obj key  x000D        x000D       x000D    return filtered x000D    x000D   x000D  const myObject     x000D    a  1  x000D    b   bananas   x000D    d  null x000D    x000D   x000D  const result   filterByKeys myObject    a    d    e        a  1  d  null  x000D  console log result  x000D   x000D   x000D

User · Answer

Just change filter to omitBy   x000D   x000D  const data     aaa  111  abb  222  bbb  333    x000D  const result     omitBy data   value  key    gt   key startsWith  a     x000D  console log result   x000D   lt script src  https   cdnjs cloudflare com ajax libs lodash js 4 17 15 lodash min js  gt  lt  script gt  x000D   x000D   x000D

User · Answer

Here is an example using lodash 4 x    x000D   x000D  const data     x000D    aaa  111  x000D    abb  222  x000D    bbb  333 x000D     x000D   x000D  const result     pickBy data   value  key    gt  key startsWith  a     x000D   x000D  console log result   x000D     Object   aaa  111  abb  222   x000D   lt script src  https   cdnjs cloudflare com ajax libs lodash js 4 17 15 lodash min js  gt  lt  script gt  x000D   lt strong gt Open your javascript console to see the output  lt  strong gt  x000D   x000D   x000D

[javascript] How to filter keys of an object with lodash?

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