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? — Hassan Imam
– Hassan Imam, Commented Oct 6, 2018 at 9:58

Evya · Accepted Answer · 2018-10-06 09:54:43Z

2

Use bracket notation instead:

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

answered Oct 6, 2018 at 9:54

Evya

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Vaghani Janak · Accepted Answer · 2018-12-27 11:21:18Z

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, 2018 at 11:21

answered Oct 6, 2018 at 10:04

Vaghani Janak

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