CODEWITHSUNDEEP
javascript
user6853602
user6853602

Reputation:

Javascript array loop variable undefined

I am having a bit of trouble with a loop that reads an array:

var myStringArray = [{
  "people": [{
    "id": "123",
    "name": "name 1"
  }, {
    "id": "456",
    "name": "name 2"
  }]
}];

var arrayLength = myStringArray.length;

for (var i = 0; i < arrayLength; i++) {            
  console.log(myStringArray[i].id);
}

Where am I going wrong here?

Upvotes: 1

Views: 114

Answers (3)

alireza.salemian
alireza.salemian

Reputation: 576

because your array only haw 1 item and its people. and people don't has id property. the people contains two item that every one has their id.

for (var i = 0; i < arrayLength; i++) {
  for(var j = 0; j < myStringArray[i].length; j++)
  {
    console.log(myStringArray[i][j].id);
  } 
}

Upvotes: 0

ninjawarrior
ninjawarrior

Reputation: 326

Access id from object stored in myStringArray[0].

Here is the modified code:-

var myStringArray = [
    {
        "people":[
            {"id":"123","name":"name 1"},
            {"id":"456","name":"name 2"}
        ]
    }
];

var array = myStringArray[0].people,
    arrayLength = array.length;
for (var i = 0; i < arrayLength; i++) {

    console.log(array[i].id);

}

Upvotes: 0

Pranav C Balan
Pranav C Balan

Reputation: 115212

You need to iterate over the inner array(people property of the first element in the main array).

var myStringArray = [{
  "people": [{
    "id": "123",
    "name": "name 1"
  }, {
    "id": "456",
    "name": "name 2"
  }]
}];
var arrayLength = myStringArray[0].people.length;

for (var i = 0; i < arrayLength; i++) {
  console.log(myStringArray[0].people[i].id);
}

Although you can use Array#forEach method.

var myStringArray = [{
  "people": [{
    "id": "123",
    "name": "name 1"
  }, {
    "id": "456",
    "name": "name 2"
  }]
}];

myStringArray[0].people.forEach(function(v) {
  console.log(v.id);
});

Upvotes: 3

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