Search an array for matching attribute

Question

I have an array  I need to return a restaurant s name  but I only know the value of its  food  attribute  not it s index number    For example  how could I return  KFC  if I only knew  chicken    restaurants              restaurant       name     McDonald s    food     burger            restaurant       name     KFC           food     chicken            restaurant       name     Pizza Hut     food     pizza

User · Accepted Answer

for var i   0  i  lt  restaurants length  i        if restaurants i  restaurant food     chicken           return restaurants i  restaurant name

User · Answer

you can also use the Array find feature of es6  the doc is here  return restaurants find item   gt       return item restaurant food     chicken

User · Answer

Chap - you can use this javascript lib  DefiantJS  http   defiantjs com   with which you can filter matches using XPath on JSON structures  To put it in JS code   var data           restaurant      name    McDonald s    food    burger             restaurant      name    KFC           food    chicken             restaurant      name    Pizza Hut     food    pizza         res   JSON search  data       food  pizza        console log  res 0  name       Pizza Hut   DefiantJS extends the global object with the method  search  and returns an array with matches  empty array if no matches were found   You can try out the lib and XPath queries using the XPath Evaluator here   http   www defiantjs com  xpath evaluator

User · Answer

you can use ES5 some  Its pretty first by using callback  function findRestaurent foodType        var restaurant      restaurants some function  r            if  r food     id                restaurant   r              return true                     return restaurant

User · Answer

Must be too late now  but the right version would be    for var i   0  i  lt  restaurants restaurant length  i        if restaurants restaurant i  food     chicken           return restaurants restaurant i  name

User · Answer

let restaurant   restaurants find element   gt  element restaurant food     quot chicken quot      The find   method returns the value of the first element in the provided array that satisfies the provided testing function   in  https   developer mozilla org pt-PT docs Web JavaScript Reference Global Objects Array find

User · Answer

In this case i would use the ECMAscript 5 Array filter  The following solution requires array filter   that doesn t exist in all versions of IE    Shims can be found here  MDN Array filter or ES5-shim  var result   restaurants filter function  chain        return chain restaurant food      chicken      0  restaurant name

User · Answer

for  x in restaurants        if  restaurants x  restaurant food     chicken             return restaurants x  restaurant name

[javascript] Search an array for matching attribute

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