Hi there, my name is [Rahul](https://rahul.biz) and I am 18 years old. My goal is to become a successful developer, and I am interested in building web apps with frontend technologies.

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Today, I'd like to share some useful JavaScript stuff I have saved and I think it can help make your life as a developer easier.

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Let's get started!


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1. Generate a random number between two values: `const randomNumber = Math.random() * (max - min) + min`

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2. Check if a number is an integer: `const isInteger = (num) => num % 1 === 0`

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3. Check if a value is `null` or `undefined`: `const isNil = (value) => value === null || value === undefined`

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4. Check if a value is a truthy value: `const isTruthy = (value) => !!value`

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5. Check if a value is a falsy value: `const isFalsy = (value) => !value`

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6. Check if a value is a valid credit card number:

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```javascript
const isCreditCard = (cc) => {
  const regex = /(?:4[0-9]{12}(?:[0-9]{3})?|[25][1-7][0-9]{14}|6(?:011|5[0-9][0-9])[0-9]{12}|3[47][0-9]{13}|3(?:0[0-5]|[68][0-9])[0-9]{11}|(?:2131|1800|35\d{3})\d{11})/;
  return regex.test(cc);
}
```

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 7. Check if a value is an object: `const isObject = (obj) => obj === Object(obj)`

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 8. Check if a value is a function: `const isFunction = (fn) => typeof fn === 'function'`

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 9. Remove Duplicated from Array `const removeDuplicates = (arr) => [...new Set(arr)];`

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10. Check if a value is a promise: `const isPromise = (promise) => promise instanceof Promise`

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11. Check if a value is a valid email address:

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```javascript
	const isEmail = (email) => {
  const regex = /(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))/;
  return regex.test(email);
}
```

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12. Check if a string ends with a given suffix: `const endsWith = (str, suffix) => str.endsWith(suffix)`

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13. Check if a string starts with a given prefix: `const startsWith = (str, prefix) => str.startsWith(prefix)`

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14. Check if a value is a valid URL:

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```javascript
const isURL = (url) => {
  const regex = /(?:http(s)?:\/\/)?[\w.-]+(?:\.[\w\.-]+)+[\w\-\._~:/?#[\]@!\$&'\*\+,;=.]+/;
  return regex.test(url);
}
```

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15. Check if a value is a valid hexadecimal color code:

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```javascript
const isHexColor = (hex) => {
  const regex = /#?([0-9A-Fa-f]{6}|[0-9A-Fa-f]{3})/;
  return regex.test(hex);
}
```

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16. Check if a value is a valid postal code:

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```javascript
const isPostalCode = (postalCode, countryCode) => {
  if (countryCode === 'US') {
    const regex = /[0-9]{5}(?:-[0-9]{4})?/;
    return regex.test(postalCode);
  } else if (countryCode === 'CA') {
    const regex = /[ABCEGHJKLMNPRSTVXY][0-9][ABCEGHJKLMNPRSTVWXYZ] [0-9][ABCEGHJKLMNPRSTVWXYZ][0-9]/;
    return regex.test(postalCode.toUpperCase());
  } else {
    // Add regex for other country codes as needed
    return false;
  }
}
```

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17. Check if a value is a DOM element:

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```javascript
const isDOMElement = (value) => typeof value === 'object' && value.nodeType === 1 && typeof value.style === 'object' && typeof value.ownerDocument === 'object';
```

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18. Check if a value is a valid CSS length (e.g. `10px`, `1em`, `50%`):

```javascript
const isCSSLength = (value) => /([-+]?[\d.]+)(%|[a-z]{1,2})/.test(String(value));
```

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19. Check if a value is a valid date string (e.g. `2022-09-01`, `September 1, 2022`, `9/1/2022`):

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```javascript
const isDateString = (value) => !isNaN(Date.parse(value));
```

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20. Check if a value is a number representing a safe integer (those integers that can be accurately represented in JavaScript): `const isSafeInteger = (num) => Number.isSafeInteger(num)`

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21. Check if a value is a valid Crypto address:

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```javascript
//Ethereum
const isEthereumAddress = (address) => {
  const regex = /0x[a-fA-F0-9]{40}/;
  return regex.test(address);
}

//bitcoin
const isBitcoinAddress = (address) => {
  const regex = /[13][a-km-zA-HJ-NP-Z0-9]{25,34}/;
  return regex.test(address);
}

// ripple
const isRippleAddress = (address) => {
  const regex = /r[0-9a-zA-Z]{33}/;
  return regex.test(address);
}
```

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21. Check if a value is a valid RGB color code

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```javascript
const isRGBColor = (rgb) => {
  const regex = /rgb$\s*([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\s*,\s*([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\s*,\s*([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\s*$/;
  return regex.test(rgb);
}
```

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22. Quickly create an array of characters from a string:

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```javascript
const string = "abcdefg";
const array = [...string];
```

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23. Quickly create an object with all the properties and values of another object, but with a different key for each property

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```javascript
const original = {a: 1, b: 2, c: 3};
const mapped = {...original, ...Object.keys(original).reduce((obj, key) => ({...obj, [key.toUpperCase()]: original[key]}), {})};
```

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24. Quickly create an array of numbers from 1 to 10

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```javascript
const array = [...Array(10).keys()].map(i => i + 1);
```

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25. Quickly shuffle an array

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```javascript
const shuffle = (array) => array.sort(() => Math.random() - 0.5);
```

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26. Convert an array-like object (such as a NodeList) to an array

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```javascript
const toArray = (arrayLike) => Array.prototype.slice.call(arrayLike);
```

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27. Sort Arrays

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```javascript
//Ascending
const sortAscending = (array) => array.sort((a, b) => a - b);

//Descending
const sortDescending = (array) => array.sort((a, b) => b - a);
```

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28. Debounce a function

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```javascript
const debounce = (fn, time) => {
  let timeout;
  return function(...args) {
    clearTimeout(timeout);
    timeout = setTimeout(() => fn.apply(this, args), time);
  };
};
```

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29. Open a new tab with a given URL

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```javascript
const openTab = (url) => {
  window.open(url, "_blank");
};
```

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30. Get the difference between two dates

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```javascript
const dateDiff = (date1, date2) => Math.abs(new Date(date1) - new Date(date2));
```

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31. Generate a random string of a given length

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```javascript
const randomString = (length) => {
  let result = "";
  const characters = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
  for (let i = 0; i < length; i++) {
    result += characters.charAt(Math.floor(Math.random() * characters.length));
  }
  return result;
};
```

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32. Get value of cookie

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```javascript
const getCookie = (name) => {
  const value = `; ${document.cookie}`;
  const parts = value.split(`; ${name}=`);
  if (parts.length === 2) return parts.pop().split(";").shift();
};
```


---

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Thank you for Reading. It is important to note that simply copying and pasting code without understanding how it works can lead to problems down the line.

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It is always a good idea to test the code and ensure that it functions properly in the context of your project.

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Additionally, don't be afraid to customize the code to fit your specific needs. As a helpful tip, consider saving a collection of useful code snippets for quick reference in the future.

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I am also learning if I am going wrong somewhere, let me know.


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Also Published [Here](https://www.rahul.biz/blog/32-javascript-snippets)

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