CODEWITHSUNDEEP
javascriptmobx
Wonka
Wonka

Reputation: 8674

MobX - Retrieve index of observable array object?

When narrowing down a selection to a single object in an observable array, how can I get that object's index efficiently?

@observable questionsList = [{
  id: 1,
  question: "Is the earth flats?",
  answer: "Some long answer here..."
}, {
  id: 2,
  question: "Does the moon have life?",
  answer: "Some long answer here..."
}];

const quesitonId = 2; 
const question = this.questionsList.find(q => q.id === questionId);
const questionIndex = // should be 1

Upvotes: 2

Views: 2280

Answers (1)

Tholle
Tholle

Reputation: 112787

You could use the findIndex:

questionsList.findIndex(q => q.id === 2);


var questionsList = [{
  id: 1,
  question: "Is the earth flats?",
  answer: "Some long answer here..."
}, {
  id: 2,
  question: "Does the moon have life?",
  answer: "Some long answer here..."
}];

console.log(questionsList.findIndex(q => q.id === 2));

Upvotes: 11

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