Create a randomized string of numbers that includes specific digits while excluding others

Question

Create a randomized string of numbers that includes specific digits while excluding others

I am struggling with generating strings in JavaScript. Specifically, I have an array of numbers from which a string needs to be generated. The string must contain at least 1 number from the array, but must not contain a specific number given by the user. Additionally, the string length must be exactly 7 digits long.

var incNumber = ["15","51","14","41","55","39","23"];
var exclude = ... //input from user

My current approach involves randomly selecting a number from the array, then choosing a random position in the string, and finally filling in the remaining digits with random numbers. However, I keep encountering issues where the process takes too long or causes my browser to freeze, especially when checking for the excluded number.

//randomly select a number
var getRandom = incNumber[Math.floor(Math.random() * incNumber.length)];

//randomly determine position of the selected number 
var position = Math.floor(Math.random() * 6);

//calculate length of string after the selected number
var afterlen = 7 - (position+2);

//genNum(...) is a function I use to generate a string of numbers with a specific length
var nstr = genNum(position) + getRandom + genNum(afterlen);

while (nstr.includes(exclude)) {
nstr = genNum(position) + getRandom + genNum(afterlen);
}

I am looking for ways to optimize this process and prevent long loading times or browser freezes. Any suggestions on how to improve this would be greatly appreciated.

Update: This task is part of my homework assignment related to generating phone numbers. The final string format should resemble something like "37915002".

javascript

Answer 1

Answer №1

Updated my code once again

Is this solution more aligned with your requirements now? The code has become a bit messy and I'm not entirely confident if it's accurate (I never am.. xD) but hopefully, it sparks some ideas for you.

// Variables
var initialList = ["100", "5", "19", "88", "10", "90"];
var excludeList = ["9", "10"];
var resultLength = 7;
var finalString = "";

// Generate a filtered final array
var finalList = initialList.filter(element => {
  let shouldBeIncluded = true;
  excludeList.forEach(excluder => {
    Array.from(excluder).forEach(excluderFragment => {
      if (element.includes(excluderFragment)) shouldBeIncluded = false;
    });
  });
  if (shouldBeIncluded) return true;
});

// Handle case where all elements are excluded
if (finalList.length == 0) {
  // Implement error handling here
} else {
  // Form the final list
  for (let i = 0; i < resultLength; i++) {
    finalString += finalList[Math.floor(Math.random() * finalList.length)];
  }
  // Trim the list due to multiple digit values
  finalString = finalString.slice(0, 7);
  console.log(finalString);
}

Answer 2

Updated my code once again

Is this solution more aligned with your requirements now? The code has become a bit messy and I'm not entirely confident if it's accurate (I never am.. xD) but hopefully, it sparks some ideas for you.

// Variables
var initialList = ["100", "5", "19", "88", "10", "90"];
var excludeList = ["9", "10"];
var resultLength = 7;
var finalString = "";

// Generate a filtered final array
var finalList = initialList.filter(element => {
  let shouldBeIncluded = true;
  excludeList.forEach(excluder => {
    Array.from(excluder).forEach(excluderFragment => {
      if (element.includes(excluderFragment)) shouldBeIncluded = false;
    });
  });
  if (shouldBeIncluded) return true;
});

// Handle case where all elements are excluded
if (finalList.length == 0) {
  // Implement error handling here
} else {
  // Form the final list
  for (let i = 0; i < resultLength; i++) {
    finalString += finalList[Math.floor(Math.random() * finalList.length)];
  }
  // Trim the list due to multiple digit values
  finalString = finalString.slice(0, 7);
  console.log(finalString);
}

Answer 3

Answer №2

To begin, you can remove the unwanted number from the incNumber array and proceed with the same process on the new array.

var incNumber = ["15","51","14","41","55","39","23"];
var exclude = "12";

var filteredNumbber =incNumber.filter(number=> number!==exclude);
var random = filteredNumbber[Math.floor(Math.random() * filteredNumbber.length)];

If we consider exclude to be an array of values instead of a single value, the formula would be adjusted as follows:

var incNumber = ["15","51","14","41","55","39","23"];
var exclude = ["15"];

var filteredNumbber =incNumber.filter(number=> !exclude.includes(number));
var random = filteredNumbber[Math.floor(Math.random() * filteredNumbber.length)];

It has been mentioned that the random variable might become undefined if all numbers in incNumber are excluded. In such a scenario, it is advisable to include an additional check to prevent this:

if (random!==undefined) var nstr = genNum(position)+random+genNum(afterlen);

Answer 4

To begin, you can remove the unwanted number from the incNumber array and proceed with the same process on the new array.

var incNumber = ["15","51","14","41","55","39","23"];
var exclude = "12";

var filteredNumbber =incNumber.filter(number=> number!==exclude);
var random = filteredNumbber[Math.floor(Math.random() * filteredNumbber.length)];

If we consider exclude to be an array of values instead of a single value, the formula would be adjusted as follows:

var incNumber = ["15","51","14","41","55","39","23"];
var exclude = ["15"];

var filteredNumbber =incNumber.filter(number=> !exclude.includes(number));
var random = filteredNumbber[Math.floor(Math.random() * filteredNumbber.length)];

It has been mentioned that the random variable might become undefined if all numbers in incNumber are excluded. In such a scenario, it is advisable to include an additional check to prevent this:

if (random!==undefined) var nstr = genNum(position)+random+genNum(afterlen);

Create a randomized string of numbers that includes specific digits while excluding others

Answer №1

Answer №2

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