Only JSON objects with a boolean value of true will be returned

I am working on returning JSON objects in JavaScript/TypeScript that have a true boolean value for the "team" property. For example, the JSON data I am using is as follows:

{
    "state": "Texas",
    "stateId": 1,
    "team": true
},
{
    "state": "California",
    "stateId": 5,
    "team": false
},
{
    "state": "Rhode Island",
    "stateId": 14,
    "team": true
}

My goal is to create an array containing only Texas and Rhode Island. However, my current code does not properly filter based on the boolean value of "team". Here is the snippet:

jsonString: any;
stateArray: any;

constructor() {
this.jsonString = JSON.stringify(data);
this.stateArray = JSON.parse(this.jsonString);

  this.stateArray.filter(function(array) {
  if (data["team"] === true) {
      return array;
  }
});

console.log(this.stateArray);

Any assistance or insights on where I might be going wrong would be greatly appreciated. Thank you!

javascriptarraysjsontypescriptboolean

Answer №1

When using Array.filter, the callback function is executed for each element in the array, expecting a single element as a parameter and returning a boolean value. Give this a try:

let stateArray = [{
    "state": "Texas",
    "stateId": 1,
    "team": true
},
{
    "state": "California",
    "stateId": 5,
    "team": false
},
{
    "state": "Rhode Island",
    "stateId": 14,
    "team": true
}]

let result = stateArray.filter(function(state) {
  return state.team;
});

console.log(result);

Answer №2

If you want to achieve this in just one line, you can utilize the arrow operator from ES6.

Check out the code snippet below.

let stateArray = [{
    "state": "Texas",
    "stateId": 1,
    "team": true
},
{
    "state": "California",
    "stateId": 5,
    "team": false
},
{
    "state": "Rhode Island",
    "stateId": 14,
    "team": true
}]

let result = stateArray.filter(state => state.team);

console.log(result);

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