How do I retrieve a value from an array using a variable with Node.js

Question

I'm fairly new to Node.js and was unsure how to title the question so apologies if it is misleading. I suspect it will be fairly straight forward but have been unable to find the answer whilst searching.

I have an array of values as shown below.

  const data = {
    "A": ["apples", "avocado", "antler","arrow",],
    "B": ["banana", "beetroot", "ball", "baboon",],
    "C":["carrot"],
    }

I can access the value apples by doing data.A[0] but I would like to use a variable to replace the letter so it can be changed dynamically.

For example

var letter = "A"
console.log(data.letter[0])

Is there something I am missing syntactically to allow for me to do this or is it something to do with it being a string?

Thank You

Possible duplicate of [JavaScript property access: dot notation vs. brackets?](https://stackoverflow.com/questions/4968406/javascript-property-access-dot-notation-vs-brackets) — Hassan Imam, Oct 06 '18 at 09:58

score 2 · Accepted Answer · answered Oct 06 '18 at 09:54

2

Use bracket notation instead:

console.log(data[letter][0]) // apples

answered Oct 06 '18 at 09:54

Evya

2,325
3
11
22

Vaghani Janak · Answer 2 · 2018-12-27T11:21:18.350

0

You can use the following example to retrieve a value from an array using a variable with Node.js:

console.log(data[letter][0])     // apples
console.log(data.A[0]);          // apples
console.log(data['A'][0]);       // apples

edited Dec 27 '18 at 11:21

answered Oct 06 '18 at 10:04

Vaghani Janak

601
5
14

How do I retrieve a value from an array using a variable with Node.js

2 Answers2