JavaScript - using the users input as function call

Question

I'm working on a small javascript project. I'd like to receive a users console input and furthermore use the input to calculate some values.

I capture the users input in a variable called answer.

when using console.log(answer) the answer get printed.

let's say the user's answer was MILK

my current (working and hardcoded) call looks something like this:

let p = 0;
call.prices('MILKPRICE', (err, tic) => { p = tic.MILKPRICE; });

now I'd like to replace the word 'milk' with the user's answer

let p = 0;
call.prices(answer+'PRICE', (err, tic) => { p = tic.answer+'PRICE'; });

which returns undefined. is there a way to actually use the user's input and not hardcoding all possible records?

thank you very much

What is call.prices function? can you share the definition of this function? — Abhilash Augustine
– Abhilash Augustine, Commented Aug 18, 2021 at 13:06
unfortunately i don't have access to call.prices, however, it's mainly the issue that I cannot get p = tic.answer+'PRICE' this to actually use the user's input — lechnerio
– lechnerio, Commented Aug 18, 2021 at 13:11

Christian · Accepted Answer · 2021-08-18 13:13:25Z

3

If I identify your code correctly you are trying to use the dot notation to access a key in an object. That methode, thought nicer to read and write does not support variables, however you can simply use brackets for accessing the field.

Like so:

const prices = {
  MILKPRICE: 2,
  WATERPRICE: 1
}
const answer = "MILK"

// this will fail
console.log(prices.answer+"PRICE");

// this will work
console.log(prices[answer+"PRICE"]);

answered Aug 18, 2021 at 13:13

Christian

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1 Comment

lechnerio Over a year ago

thank you! that did the job just perfectly fine. call.prices(answer+'PRICE', (err, tic) => { p = tic[answer+'PRICE']; });

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