Javascript - How can I generate multiple random numbers?

jpop
August 7, 2023
254 views
3 votes
3 Answers

I’m pretty new at JavaScript. I just finished a JavaScript course so I’m working on some projects I came up with myself. Also any advice outside of the question im asking is welcomed too. So I’m trying to generate multiple different random letter phrases ranging from 1 letter to 6 letters with the object but I cant figure out how to generate several. Im only able to do one phrase, Is there a way to do this, Im thinking with some kind of loop? Not sure, thanks

const Words = {
  0: 'a', 1: 'b', 2: 'c', 3: 'd', 4: 'e',
  5: 'f', 6: 'g', 7: 'h', 8: 'i', 9: 'j',
  10: 'k', 11: 'l', 12: 'm', 13: 'n', 14: 'o',
  15: 'p', 16: 'q', 17: 'r', 18: 's', 19: 't',
  20: 'u', 21: 'v', 22: 'w', 23: 'x', 24: 'y', 25: 'z'
}

const phraseLength = Math.floor(Math.random() * (5 - 1 + 1)) + 1

const firstWord = Words[Object.keys(Words)[Math.floor(Math.random() * Object.keys(Words).length)]]

const secondWord = Words[Object.keys(Words)[Math.floor(Math.random() * Object.keys(Words).length)]]

const thirdWord = Words[Object.keys(Words)[Math.floor(Math.random() * Object.keys(Words).length)]]

const fourthWord = Words[Object.keys(Words)[Math.floor(Math.random() * Object.keys(Words).length)]]

const fifthWord = Words[Object.keys(Words)[Math.floor(Math.random() * Object.keys(Words).length)]]

const sixthWord = Words[Object.keys(Words)[Math.floor(Math.random() * Object.keys(Words).length)]]

const numberstudents = () => {}

const name = nameLength => {
  if (phraseLength === 1) {
    return firstWord
  } else if (phraseLength === 2) {
    return firstWord + secondWord
  } else if (phraseLength === 3) {
    return firstWord + secondWord + thirdWord
  } else if (phraseLength === 4) {
    return firstWord + secondWord + thirdWord + fourthWord
  } else if (phraseLength === 5) {
    return firstWord + secondWord + thirdWord + fourthWord + fifthWord
  } else if (phraseLength === 6) {
    firstWord + secondWord + thirdWord + fourthWord + fifthWord + sixthWord
  }
}

console.log(name(phraseLength))

Im fairly new at coding and this is my first time asking for any any kind of help on the internet. So once again thanks

Tags: javascript

Answers

const Words = {
  0: 'a', 1: 'b', 2: 'c', 3: 'd', 4: 'e',
  5: 'f', 6: 'g', 7: 'h', 8: 'i', 9: 'j',
  10: 'k', 11: 'l', 12: 'm', 13: 'n', 14: 'o',
  15: 'p', 16: 'q', 17: 'r', 18: 's', 19: 't',
  20: 'u', 21: 'v', 22: 'w', 23: 'x', 24: 'y', 25: 'z'
};

const generateRandomPhrase = length => {
  let phrase = '';
  for (let i = 0; i < length; i++) {
    const randomIndex = Math.floor(Math.random() * Object.keys(Words).length);
    phrase += Words[randomIndex];
  }
  return phrase;
};

const numberstudents = () => {
  const numberOfPhrases = 5; // Change this to the desired number of phrases
  for (let i = 0; i < numberOfPhrases; i++) {
    const phraseLength = Math.floor(Math.random() * (6 - 1 + 1)) + 1;
    const randomPhrase = generateRandomPhrase(phraseLength);
    console.log(randomPhrase);
  }
};

numberstudents();

There are a lot of ways you could do this, but a simple method (if you’re familiar with arrays) would be:

// This is just a shortcut to generating an array of a-z
const alphabet = Array.from({ length: 26 }, (_, i) =>
  String.fromCharCode(97 + i))

const phraseLength = Math.floor(Math.random() * (5 - 1 + 1)) + 1

const name = (nameLength) =>
  // Make an array with the length specified in the arg
  Array.from({ length: phraseLength }, (_) =>
    // Select letters at random from the array
    alphabet[Math.floor(Math.random() * alphabet.length)])
    // Join the resultant array to a string
    .join('')

console.log(name(phraseLength))

/*
Naming:
Changed the name from "Words" to letters as that is really what they 
are. Naming things is one of the hardest things to do, but good names 
allow us to think and reason more clearly.

Data type choice:
Use an Array rather than an Object, as Arrays already allow us to 
access a property by index. Also makes code cleaner and faster, with 
less Object.key() calls.
*/
const letters = [
  "a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p",
  "q","r","s","t","u","v","w","x","y","z"
];

/*
Encapsulation:
Use functions whenever you have operations that run repeatedly. We need 
to get a random number both to get the length of a phrase, and to pick
a random letter. We'll put that in a function, and call that function
instead. This allows us to run an operation repeatedly without hard 
coding it.
*/
function getRandomNumber(min, max) {
  return Math.floor(Math.random() * max) + min;
}

// The word generator could also be put in a function
function getRandomWords(words) {
  for (let i = 0; i < words; i++) {
    const wordLength = getRandomNumber(1, 6);
    let word = "";
    for (let j = 0; j < wordLength; j++) {
      word += letters[getRandomNumber(0, 26)];
    }
    console.log(word);
  }
}

getRandomWords(5); //logs 5 random words

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Javascript – How can I generate multiple random numbers?

Answers