JavaScriptSource

How To Generate A Random String In JavaScript

JavaScriptSource Editor — Mon, 17 Apr 2023 08:38:00 +0000

Generating a random string in JavaScript can be useful for a variety of tasks, such as generating unique identifiers or password reset tokens. There are a few different ways to generate a random string in JavaScript, but one of the simplest is to use the built-in Math.random() function.

Here is an example of how to use Math.random() to generate a random string of a specified length:

function generateRandomString(length) {
  let result = '';
  const characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
  const charactersLength = characters.length;
  for (let i = 0; i < length; i++) {
    result += characters.charAt(Math.floor(Math.random() * charactersLength));
  }
  return result;
}
console.log(generateRandomString(5)); // example output: "g5X8y"

In this example, the generateRandomString function takes a single argument, length, which specifies the length of the random string to generate. The function then declares a variable result which is initially set to an empty string. Next, it declares a string characters containing all the characters that can be used in the random string.

The function then uses a for loop to iterate length number of times. In each iteration, it uses Math.random() to generate a random number between 0 and 1, and then multiplies that number by the length of the characters string. This results in a random index between 0 and the length of the characters string. The charAt() method is then used to retrieve the character at that index in the characters string, and the result is added to the result string.

Finally, the result string is returned.

You can also use the crypto library to generate a random string. This is particularly useful for cryptographic purposes.

function generateRandomString(length) {
  let result = '';
  const characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
  const charactersLength = characters.length;
  const crypto = window.crypto || window.msCrypto;
  const array = new Uint8Array(length);
  crypto.getRandomValues(array);
  array.forEach(x => {
    result += characters[x % charactersLength];
  });
  return result;
}
console.log(generateRandomString(5));

In this approach, we use the crypto.getRandomValues() method to generate a random number of bytes, then use the modulo operator % on the value of each byte and the length of characters string to get the corresponding character to concatenate it to the result string.

In both examples, you can change the characters string to suit your needs, for example you can remove characters that you don’t want to include in the string or add more characters to the set.

How To Generate a GUID in JavaScript

JavaScriptSource Editor — Fri, 10 Mar 2023 09:44:00 +0000

A globally unique identifier (GUID) is a 128-bit value that is used to identify resources, such as records in a database, in a unique and consistent manner across different systems. In JavaScript, there are several libraries and built-in methods that can be used to generate a GUID.

One way to generate a GUID in JavaScript is to use the crypto module, which is built into modern web browsers and Node.js. The crypto.getRandomValues() method generates a cryptographically-secure, random array of values that can be used to create a GUID. Here is an example of how to use the crypto module to generate a GUID:

function generateGUID() {
  const array = new Uint8Array(16);
  crypto.getRandomValues(array);

  array[6] = (array[6] & 0x0f) | 0x40;
  array[8] = (array[8] & 0x3f) | 0x80;

  let guid = '';
  for (let i = 0; i < array.length; i++) {
    let value = array[i].toString(16);
    if (value.length === 1) {
      value = '0' + value;
    }
    guid += value;
    if (i === 3 || i === 5 || i === 7 || i === 9) {
      guid += '-';
    }
  }
  return guid;
}

Another popular library for generating GUIDs in JavaScript is the uuid library. It is a simple, lightweight library that can be used to generate a GUID in a single line of code:

const uuid = require('uuid');

const newGUID = uuid.v4();

import { v4 as uuidv4 } from 'uuid';
const newGUID = uuidv4();

Both of these methods will generate a unique GUID that can be used to identify resources in a consistent and unique manner. You can choose which method you prefer or which fits your use case best.

Range generator

JavaScriptSource Editor — Fri, 19 Aug 2022 09:35:00 +0000

Creates a generator, that generates all values in the given range using the given step. Use a while loop to iterate from start to end, using yield to return each value and then incrementing by step. Omit the third argument, step, to use a default value of 1.

const rangeGenerator = function* (start, end, step = 1) {
  let i = start;
  while (i < end) {
    yield i;
    i += step;
  }
};

// EXAMPLE
for (let i of rangeGenerator(6, 10)) console.log(i);
// Logs 6, 7, 8, 9

Source

https://www.30secondsofcode.org/js/s/range-generator

Generate a random hexadecimal color code

JavaScriptSource Editor — Mon, 04 Apr 2022 10:48:00 +0000

Use Math.random() to generate a random 24-bit (6 * 4bits) hexadecimal number. Use bit shifting and then convert it to an hexadecimal string using Number.prototype.toString().

Also check out this random color generator.

const randomHexColorCode = () => {
  let n = (Math.random() * 0xfffff * 1000000).toString(16);
  return '#' + n.slice(0, 6);
};

// EXAMPLE
randomHexColorCode(); // '#e34155'

Source

https://www.30secondsofcode.org/js/s/random-hex-color-code

DHTML Tooltip Generator 3

JavaScriptSource Editor — Sat, 13 Jan 2018 19:20:00 +0000

Sometimes the HTML “alt=” isn’t enough to relay the detail you’d like it to. Here is a tooltip generator that will allow you to give your users more interactive tooltips. This script will allow you to create a custom DHTML tooltip box on your site.

Free JavaScripts provided by The JavaScript Source

Array Creator 3

JavaScriptSource Editor — Sat, 13 Jan 2018 18:24:00 +0000

General

Coding large arrays can be a bit of a repetitive chore. This script will create a generator that will help speed up the process. Easy to use and implement!

Notes

Created by: Mr. J
Web Site: http://www.huntingground.net/

When using the numerical value option enter the array length and an index value.
A number is then appended to the index value starting at 000.
A second value can also be added after the number by entering in the second textbox, if this is not required leave the box blank.
If the numerical value option is not used each individual array index value is typed in the text field, you can then either click the “Manual Enter” button or press the “Return” key to confirm your index value.

Source Code

Paste this source code into the designated areas.

External file

Paste this code into an external JavaScript file named: arrayCreator.js

/* This script and many more are available free online at
The JavaScript Source!! http://javascriptsource.com
Created by: Mr. J | http://www.huntingground.net/ */

function init(){
  array_name=document.f1.t1.value //name of array
  val2=document.f1.t3a.value
  ext=document.f1.t4.value
  for(r=0;r” // opening array type 2 & 3
  }

  if(document.f1.r2[0].checked==true){ // if indexed values
    make_array1()
  }

  if(document.f1.r2[1].checked==true){ // if non index values
    make_array2()
  }
}

function make_array1(){
  array_length=document.f1.t2.value-1 // length of array
  index_values=document.f1.t3.value // index value

  if(array_length==””||array_length==0){ // make sure a viable number is used
    document.getElementById(“display”).innerHTML=”Please Enter a Number”
    document.f1.b2.disabled=true
    return
  } else {
    if(!ns){document.f1.cpy.disabled=false}
  }

  for(num=0;num9&&num0){
      i=num+val2+ext}
      else{i=num+val2}

  if(option==0){ // insert inner indexes for type 1
    document.getElementById(“display”).innerHTML+=”””+index_values+i+””, ”
  } else {
    if(option==1){ // insert inner indexes for type 2
      document.getElementById(“display”).innerHTML+=array_name+”[“+j+”]=”
      document.getElementById(“display”).innerHTML+=”””+index_values+i+””
”
    } else { // insert inner indexes for type 3
      document.getElementById(“display”).innerHTML+=array_name+”[“+array_name+”.length]=””+index_values+i+””
”
    }
  }
}

if(num9&&num100){num=num}

if(document.f1.t4.value.length>0){
  i= num+val2+ext}
  else{i=num+val2}

  if(option==0){ // insert last indexes for type 1
    document.getElementById(“display”).innerHTML+=”””+index_values+i+””)”
  } else {
    if(option==1){ // insert last indexes for type 2
      document.getElementById(“display”).innerHTML+=array_name+”[“+(j+1)+”]=”
      document.getElementById(“display”).innerHTML+=”””+index_values+i+””
”
    } else { // insert last indexes for type 3
      document.getElementById(“display”).innerHTML+=array_name+”[“+array_name+”.length]=””+index_values+i+””
”
    }
  }
}

index_value=new Array()
count= 0
last=0

function make_array2(){
  if(!ns){document.f1.cpy.disabled=false}
  for(r=0;r0){
    index_value[count]=document.f1.t3.value+ext}
  else {
    index_value[count]=document.f1.t3.value
  }

  for(i=0;i”
      } else {
        document.getElementById(“display”).innerHTML+=array_name+”[“+i+”]=””+index_value[i]+””
”
      }
    }
  }

  if(option==0){
    document.getElementById(“display”).innerHTML+=”””+index_value[i]+””)”
  } else {
    if(option==2){
      document.getElementById(“display”).innerHTML+=array_name+”[“+array_name+”.length]=””+index_value[i]+””
”
    } else {
      document.getElementById(“display”).innerHTML+=array_name+”[“+i+”]=””+index_value[i]+””
”
    }
  }
  count++
  document.f1.t3.select()
  last=chkrad
}

function oreset(){
  count=0
  document.f1.t3.value=””
  document.getElementById(“display”).innerHTML=””
  document.f1.t3.select()
}

function chk(){
  if(document.f1.r2[0].checked==true){
    document.f1.t2.disabled=false
    document.getElementById(“sp”).disabled=false
    document.f1.t2.style.backgroundColor=”#FFFFFF”
    document.f1.b1.disabled=false
    document.f1.b2.disabled=true
    document.f1.b3.disabled=true
    document.f1.t3a.disabled=false
    document.f1.t3a.style.backgroundColor=”#FFFFFF”
  } else {
    document.f1.t2.disabled=true
    document.getElementById(“sp”).disabled=true
    document.f1.t2.style.backgroundColor=”#c0c0c0″
    document.f1.b1.disabled=true
    document.f1.b2.disabled=false
    document.f1.b3.disabled=false
    document.f1.t3.select()
    document.f1.t3a.disabled=true
    document.f1.t3a.style.backgroundColor=”#c0c0c0″
  }
}

function Copy(id){
  if(ns){
    alert(“Sorry, Netscape does not recongise this function”)
    document.f1.cpy.disabled=true
    return
  }
  copyit=id
  textRange = document.body.createTextRange();
  textRange.moveToElementText(copyit);
  textRange.execCommand(“Copy”);
  alert(“Copying Complete.nnPlease Paste into your SCRIPT”)
}

ns=document.getElementById&&!document.all

function getKey(e) {
  pressed_key=(!ns)?event.keyCode:e.which
  if( pressed_key==13){
    init()
  }
}
document.onkeypress = getKey;

CSS

Paste this code into your external CSS file or in the