Question 49960 in Javascript Question posted in
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JavaScript object reference giving undefined value

I am very new to javascript and I was making a rock, paper, scissor game, but the below lines of code is giving me undefined value can someone explain me in simple words why console log is giving me undefined as output .

let userval = prompt("enter R,P,S");
const object={
  R : "ROCK",
  P : "PAPER",
  S : "SCISSOR"
};
console.log(object.userval)

I want the console to log "ROCK" when i enter R in prompt and so on.

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2

Answers


  1. 0

    It looks like you are trying to reference userval as a property on the object that you defined, when really you want to be using the value to look up a property.

    Perhaps try console.log(object[userval])?

    It is helpful to set debug breakpoints in the dev tools to examine how objects are constructed as well, and to experiment with different calls in the console.

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  2. 0

    object.userval is equivalent to object['userval']. You need to use object[userval] in order to access the userval variable.

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