Read a value key of a JSON constant in Typescript with Angular

Issue

I'm trying to read a value in a JSON constant in Typescript with Angular, but just for performance I don't know if there is a way to read with a property included in the framework (or if it exists another way to do better, of course). This is my JSON constant value:

    const myConstant= {
    data : [
      {
          key1: "5",
          key2: "extract",
          key3: "unique1"
      },
      {
          key1: "5",
          key2: "extract",
          key3: "unique2"
      },
      {
        key1: "5",
          key2: "extract",
          key3: "unique3"
    }
  ]
  };

This constant has exported in another TS file just for find the key3 value for validate this in a conditional.

 validateInfo(cod:string){
    for (var i = 0; i < myConstant.data.length; i++){
      var obj = myConstant.data[i];
      for (var key in obj){
        var value = obj[key];
        if (key== "key3"){
          if (value == cod){
            return true;
          }
        }
      }
    }
    return false;
  }

So my question is, There is a way to extract the "key3" Value without doing a loop? like

myConstant.find(data.key3,'unique3');

what is the reason? I am trying to hide a view in frontend in case an user has no allowed to access using the JSON info (true or false for the previous function):

<div class="ts-cntnr" *ngIf="allowedInfo" >

Solution

Obviously there is! There are many ways you can do what you are asking for, and a simpler one is to use some() which checks if there is at least one object with a key called key3, returning a boolean result which is your desired output.

const myConstant = {
  data: [{
      key1: "5",
      key2: "extract",
      key3: "unique1"
    },
    {
      key1: "5",
      key2: "extract",
      key3: "unique2"
    },
    {
      key1: "5",
      key2: "extract",
      key3: "unique3"
    }
  ]
};

console.log(myConstant.data.some(subData => Object.keys(subData).includes("key3")))

// UPDATE
console.log(myConstant.data.some(subData => Object.keys(subData).includes("key3") && subData["key3"] == "unique3"))

Answered By - Deepak