Javascript find json value

Question

I need to search inside a json list of countries  The json is like        name    Afghanistan    code    AF       name      land Islands    code    AX       name    Albania    code    AL       name    Algeria    code    DZ       I get from database only the code and would output the entire name  So if I get  AL  I would like to retrieve from json  Albania

User · Answer

I suggest using JavaScript s Array method filter   to identify an element by value  It filters data by using a  function to test each element of the array  Return true to keep the element  false otherwise     The following function filters the data  returning data for which the callback returns true  i e  where data code equals the requested country code     function getCountryByCode code      return data filter        function data   return data code    code           var found   getCountryByCode  DZ      See the demonstration below    x000D   x000D  var data      x000D     name    Afghanistan   x000D     code    AF  x000D       x000D     name      land Islands   x000D     code    AX  x000D       x000D     name    Albania   x000D     code    AL  x000D       x000D     name    Algeria   x000D     code    DZ  x000D      x000D   x000D   x000D  function getCountryByCode code    x000D    return data filter  x000D      function data    x000D        return data code    code x000D        x000D       x000D    x000D   x000D  var found   getCountryByCode  DZ    x000D   x000D  document getElementById  output   innerHTML   found 0  name  x000D   lt div id  output  gt  lt  div gt  x000D   x000D   x000D    Here s a JSFiddle

User · Answer

var obj         name    Afghanistan    code    AF         name      land Islands    code    AX         name    Albania    code    AL         name    Algeria    code    DZ          the code you re looking for var needle    AL       iterate over each element in the array for  var i   0  i  lt  obj length  i          look for the entry with a matching  code  value   if  obj i  code    needle           we found it        obj i  name is the matched result

User · Answer

Making more general the  showdev answer  var getObjectByValue   function  array  key  value        return array filter function  object            return object key      value              Example  getObjectByValue data   quot code quot    quot DZ quot

User · Answer

Just use the ES6 find   function in a functional way   x000D   x000D  var data   name  Afghanistan  code  AF    name    land Islands  code  AX    name  Albania  code  AL    name  Algeria  code  DZ      let country   data find el   gt  el code      AL         gt   name   Albania   code   AL   console log country  name     x000D   x000D   x000D   or Lodash   find   x000D   x000D  var data   name  Afghanistan  code  AF    name    land Islands  code  AX    name  Albania  code  AL    name  Algeria  code  DZ      let country     find data    code    AL          gt   name   Albania   code   AL   console log country  name     x000D   lt script src  https   cdnjs cloudflare com ajax libs lodash js 4 17 11 lodash min js  gt  lt  script gt  x000D   x000D   x000D

User · Answer

First convert this structure to a  dictionary  object   dict      json forEach function x        dict x code    x name      and then simply  countryName   dict countryCode    For a list of countries this doesn t matter much  but for larger lists this method guarantees the instant lookup  while the naive searching will depend on the list size

[javascript] Javascript find json value

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