lodash mapping array to object

Question

Is there a built-in lodash function to take this   var params           name   foo   input   bar           name   baz   input   zle         And output this   var output         foo   bar       baz   zle       Right now I m just using Array prototype reduce     function toHash array  keyName  valueName        return array reduce function dictionary  next            dictionary next keyName     next valueName           return dictionary                 toHash params   name    input      Wondering if there s a lodash short-cut

User · Answer

This is probably more verbose than you want, but you're asking for a slightly complex operation so actual code might be involved (the horror).

My recommendation, with zipObject that's pretty logical:

_.zipObject(_.map(params, 'name'), _.map(params, 'input'));

Another option, more hacky, using fromPairs:

_.fromPairs(_.map(params, function(val) { return [val['name'], val['input']));

The anonymous function shows the hackiness -- I don't believe JS guarantees order of elements in object iteration, so callling .values() won't do.

User · Answer

It can also solve without using any lodash function like this    let paramsVal           name   foo   input   bar           name   baz   input   zle       let output        paramsVal forEach   name  input    gt     output name    input       console log output

User · Answer

This seems like a job for Object assign   const output   Object assign        params map p   gt     p name   p input        Edited to wrap as a function similar to OP s  this would be   const toHash    array  keyName  valueName    gt       Object assign        array map o   gt     o keyName    o valueName          Thanks to Ben Steward  good thinking

User · Answer

Yep it is here  using   reduce  var params           name   foo   input   bar           name   baz   input   zle          reduce params   function obj param     obj param name    param input  return obj

User · Answer

You should be using   keyBy to easily convert an array to an object   Docs here  Example usage below    x000D   x000D  var params     x000D        name   foo   input   bar     x000D        name   baz   input   zle    x000D     x000D  console log   keyBy params   name     x000D   lt script src  https   cdnjs cloudflare com ajax libs lodash js 4 17 4 lodash min js  gt  lt  script gt  x000D   x000D   x000D    If required  you can manipulate the array before using   keyBy or the object after using   keyBy to get the exact desired result

User · Answer

Another way with lodash  creating pairs  and then either construct a object or ES6 Map easily    params  map v  gt  v name  v input   fromPairs   value    or     fromPairs params map v  gt  v name  v input     Here is a working example   x000D   x000D  var params     x000D        name   foo   input   bar     x000D        name   baz   input   zle    x000D     x000D   x000D  var obj     params  map v  gt  v name  v input   fromPairs   value    x000D   x000D  console log obj   x000D   lt script src  https   cdnjs cloudflare com ajax libs lodash js 4 17 4 lodash js  gt  lt  script gt  x000D   x000D   x000D

User · Answer

Another way with lodash 4 17 2     chain params       keyBy  name        mapValues  input        value      or    mapValues   keyBy params   name     input     or with   reduce    reduce      params       acc    name  input      gt        acc   name   input

User · Answer

You can use one liner javascript with array reduce method and ES6 destructuring to convert array of key value pairs to object   arr reduce  map    name  input      gt        map   name   input

[javascript] lodash: mapping array to object

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