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I am newbie to the javascript and I wrote the simple function below. I am wonder that the function blow gave me the undefined. Is there any mistake in the function below?

function randFace() {
    return ["crown", "anchor", "heart", "spade", "club", "diamond"]
    [rand(0, 5)];
}

console.log(randFace())
sclee1
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    Are you trying to use Math.random to get a random number from 0 to 5? If Yes, you can refer https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/random#getting_a_random_number_between_two_values – Programmer Feb 18 '21 at 04:30
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    Can you add the definition of `rand` so other people can reproduce the problem? – Brian McCutchon Feb 18 '21 at 04:36
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    Does this answer your question? [Getting a random value from a JavaScript array](https://stackoverflow.com/questions/4550505/getting-a-random-value-from-a-javascript-array) – Brian McCutchon Feb 18 '21 at 04:37

6 Answers6

1

Try this,

function randFace() {
    let faces = ["crown", "anchor", "heart", "spade", "club", "diamond"]
    return faces[Math.floor(Math.random() * faces.length)];
}

console.log(randFace())
Kushan
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1

Since it is not clear what is the rand in your problem does.

Thus, in JavaScript, there is a function called random() that generates a random number between 0 and 1.

To generate the random index for the given array we need to have values between 0 and 6.

Since Math.random generated the value between 0 and 1, we need to multiply that value with the arr.length.

const arr = ["crown", "anchor", "heart", "spade", "club", "diamond"];
function randFace() {
    let rand = Math.floor(Math.random() * 6);
    
    return arr[rand];
    
}

console.log(randFace())
Not A Bot
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0

Undefined error is occurring because there is no rand() function. i believe that you want to get a random string from the array using the function. I have altered your code little bit to get the expected output. Try it to see if this is what you want

function getRandomInt(min, max) {
  min = Math.ceil(min);
  max = Math.floor(max);
  return Math.floor(Math.random() * (max - min) + min); //The maximum is exclusive and the minimum is inclusive
}
function randFace() {
    return ["crown", "anchor", "heart", "spade", "club", "diamond"]
    [getRandomInt(0, 5)];
}

console.log(randFace())
SuKu
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0

It is simple code using javscript

    const value= ["crown", "anchor", "heart", "spade", "club", "diamond"]
    var random = Math.floor(Math.random() * value.length);
 console.log(value[random]);
Divyanshi Mishra
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function randFace() {
var faces= ["crown", "anchor", "heart", "spade", "club", "diamond"]
return(faces[Math.floor(Math.random() * 5)]);
}

console.log(randFace())

I think this is what you are looking for.:)

0

rand() is an incorrect method in javascript.

You will get your desired output by the following code.

function randFace() {
    return ["crown", "anchor", "heart", "spade", "club", "diamond"]
    [Math.floor(Math.random()*5+1)];
}

console.log(randFace())

You can refer more about random in W3 Schools.

Basith
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