Loop through multiple arrays with objects inside them in angularjs

Question

I'm currently struggling to use a forEach method to loop over an array with multiple objects in it. I might be making a silly mistake but im not sure where im going wrong with this

I have an object with some arrays like this...

assistants array:

var assistants =
[  
   {    
         "countryCode":"US",
         "cityName":"San Diego",
         "geographicRegionCode":"CA"
   },
   {
         "countryCode":"AD",
         "cityName":"a",
         "geographicRegionCode":null
   }
]

function im using to loop through and return a value...

     function validateAssistants () {
          angular.forEach(assistants, function(a) {
            if(a.countryCode === "US") {
              return true;
            }
          });
      }

When i am going to debug...it keeps on saying that a is not defined. Not sure what i'm doing wrong. Can someone point me in the right direction?

Mostly because there is a typo here "countryCode": "AD".No comma — brk
– brk, Commented Aug 22, 2018 at 16:01

Emeeus · Accepted Answer · 2018-08-22 16:31:11Z

1

forEach() works like [1,2,3].forEach(callback), but the best best way, in my opinion is using some() to find if some element match, like assistants.some(o=>o.countryCode == "US").

var assistants =
[  
   {    
         "countryCode":"US",
         "cityName":"San Diego",
         "geographicRegionCode":"CA"
   },
   {
         "countryCode":"AD",
         "cityName":"a",
         "geographicRegionCode":null
   }
]


assistants.forEach((o)=>{

if(o.countryCode === "US") {
         console.log(true);
        }

})

console.log(assistants.some(o=>o.countryCode == "US"))//<-- best

forEach() iterates all elements, if you find the match at 0 position continues iterating till the end without need, some or for (with break), stops when find the match.

edited Aug 22, 2018 at 16:31

answered Aug 22, 2018 at 16:03

Emeeus

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