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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

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

• javascript
• mobx

Share Follow edited Sep 19, 2016 at 18:04 Tholle 113k2222 gold badges208208 silver badges197197 bronze badges asked Sep 19, 2016 at 17:58 WonkaWonka 8,6842222 gold badges8282 silver badges126126 bronze badges

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1 Answer 1

Sorted by: Reset to default 11

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));

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