CODEWITHSUNDEEP
javascriptarraysfor-loopobject
Eleniko
Eleniko

Reputation: 96

Loop through array object

I am trying to loop through this array

var questions = [
    {
        ask: 'is Javascript the best language?',
        correct: 0,
        answer : [
            {text: 'yes'},
            {text: 'No'}
        ]
    },
    {
        ask: 'is Javascript the most popular language?',
        correct: 1,
        answer : [
            {text: 'yes'},
            {text: 'No'}
        ]
    },

]

and the point is I want to get every question with this loop and get these questions in console log

var currentQuestion = questions.length;

for( var i = 0; i < currentQuestion; i++){
   console.log(questions[i]);
}

but console.log says: Uncaught TypeError: Cannot read property 'length' of undefined

Upvotes: 0

Views: 38

Answers (3)

Ansh
Ansh

Reputation: 25

It looks like the variable questions is not included in the same file.

Upvotes: 1

Aks Jacoves
Aks Jacoves

Reputation: 877

Use for of.. :

var questions = [
    {
        ask: 'is Javascript the best language?',
        correct: 0,
        answer : [
            {text: 'yes'},
            {text: 'No'}
        ]
    },
    {
        ask: 'is Javascript the most popular language?',
        correct: 1,
        answer : [
            {text: 'yes'},
            {text: 'No'}
        ]
    },

]

for(let values of questions){
  console.log(values);
 }

Upvotes: 0

anees
anees

Reputation: 1855

more information at https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Working_with_Objects about the js objects.

var questions = [
    {
        ask: 'is Javascript the best language?',
        correct: 0,
        answer : [
            {text: 'yes'},
            {text: 'No'}
        ]
    },
    {
        ask: 'is Javascript the most popular language?',
        correct: 1,
        answer : [
            {text: 'yes'},
            {text: 'No'}
        ]
    },

];

var currentQuestion = questions.length;

for( var i = 0; i < currentQuestion; i++){
   console.log(questions[i].ask);
}

// es6 way 

questions.map(q => {
   // console.log(q.ask); // will get all the questions
})

Upvotes: 0

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