Easy Functions

This is a collection easy utility functions I found myself copying and pasting over various personal and work projects. I am not going to gate-keep the code, that will be provided in this README as well if you just want to have them in your code base without installing the entire project. Having this project makes things easier for me, but I am not going to pretend like every project on the planet is going to need a "capitalizeFirstLetters" function.

Table of Contents

• Features
• Installing
• Capitalize First Letters
• Create Dollar Amount
• Extract Number
• Format Phone
• Trim String Properties
• Truncate Text
• Try Catch

Features

• Several utility functions that are useful in many projects.
• Source code to all of those functions is available in this README.
• No dependencies, just copy and paste the code you need.

Installing

Using npm:

npm install ez-funcs

Using yarn:

yarn add ez-funcs

Using bun:

bun install ez-funcs

Using pnpm:

pnpm add ez-funcs

Using bower:

bower install ez-funcs

Once the package is installed, you can import the library using import approach:

import { tryCatch } from 'ez-funcs';

Capitalize First Letters

This functions takes a string and returns the same string with the first letters of each word capitalized.

capitalizeFirstLetters Example

import { capitalizeFirstLetters } from 'ez-funcs';

const text = 'hello world';

const newText = capitalizeFirstLetters(text);

console.log(newText); // Output: Hello World

capitalizeFirstLetters Source Code

export function capitalizeFirstLetters(str: string | null) {
  if (!str) return '';
  return str
    .split(' ')
    .map((word) => word.charAt(0).toUpperCase() + word.slice(1))
    .join(' ');
}

Create Dollar Amount

This function takes a number or a string representing a number and returns formatted dollar amount as a string. It supports different currencies and handles invalid inputs gracefully.

createDollaraAmount Example

import { createDollarAmount } from 'ez-funcs';

const amountString = '200';

const newAmountOne = createDollarAmount(amountString);

console.log(newAmountOne); // Output: $200.00

const amountNumber = 200;

const newAmountTwo = createDollarAmount(amountNumber);

console.log(newAmountTwo); // Output: $200.00

createDollarAmount Source Code

export function createDollarAmount(
  amountInput: number | string,
  currency: SupportedCurrency = 'USD'
): string {
  if (amountInput === null || amountInput === undefined || amountInput === '') {
    const defaultAmount = 0; // Default amount if input is null, undefined, or empty string
    return defaultAmount.toLocaleString(CURRENCY_LOCALE_MAP[currency], {
      style: 'currency',
      currency: currency
    });
  }
  const numericAmount = Number(amountInput);

  // 1. Handle invalid numeric input
  if (isNaN(numericAmount)) {
    // You can decide how to handle this:
    // - Throw an error (often preferred for library functions)
    // - Return a specific string like "Invalid Amount" or an empty string
    // - Return a default formatted value like $0.00
    // For this example, let's throw an error.
    throw new TypeError(
      "Invalid 'amountInput': failed to convert to a number."
    );
  }

  // 2. Get the locale from the map
  // This replaces the large switch statement.
  const locale = CURRENCY_LOCALE_MAP[currency];

  // 3. Use a try-catch block for the toLocaleString call
  // This can catch errors if the locale or options are somehow invalid,
  // though with the current setup, it's less likely for supported currencies.
  try {
    return numericAmount.toLocaleString(locale, {
      style: 'currency',
      currency: currency // The 'currency' option takes the ISO currency code
    });
  } catch (error) {
    console.error(
      `Error formatting currency ${currency} for locale ${locale}:`,
      error
    );
    // Fallback behavior: re-throw, or return a specific error string,
    // or even a basic formatting if possible.
    // For now, let's return an error message string.
    return `Error formatting ${currency}`; // Or throw the error
  }
}

Extract Number

This function extracts a number from a string, removing all non-numeric characters except for commas and decimal points. It returns the number as a float or null if the number cannot be parsed.

extractNumber Example

import { extractNumber } from 'ez-funcs';

const inputString = '2,812.30 refund minus 25% CANCELLATION FEE.';

const result = extractNumber(inputString);

console.log(result); // Output: 2812.3

extractNumber Source Code

export function extractNumber(input: number | string) {
  input = input.toString();

  // Remove all characters except digits, commas, and decimal points
  const cleaned = input.replace(/[^0-9.,]/g, '');
  // Remove commas
  const normalized = cleaned.replace(/,/g, '');
  // Parse as float
  const number = parseFloat(normalized);
  return isNaN(number) ? null : number;
}

Format Phone

This function formats a phone number string into a standard format of (123) 456-7890. It supports both 10-digit and 11-digit numbers, where the latter starts with a '1'.

formatPhone Example

import { formatPhone } from 'ez-funcs';

const phoneNumber = '1234567890';

const formattedPhone = formatPhone(phoneNumber);

console.log(formattedPhone); // Output: (123) 456-7890

formatPhone Source Code

export function formatPhone(phoneNumber: string) {
  const cleaned = ('' + phoneNumber).replace(/\D/g, '');

  // Check for 10-digit number
  let match = cleaned.match(/^(\d{3})(\d{3})(\d{4})$/);

  // If no match, check for 11-digit number starting with 1
  if (!match && cleaned.length === 11 && cleaned.charAt(0) === '1') {
    match = cleaned.match(/^1(\d{3})(\d{3})(\d{4})$/);
  }

  if (match) {
    return `(${match[1]}) ${match[2]}-${match[3]}`;
  }

  return null;
}

Trim String Properties

This function takes an object and returns a new object with all string properties trimmed of leading and trailing whitespace. Non-string properties are left unchanged.

trimStringProperties Example

import { trimStringProperties } from 'ez-funcs';

const userInput = {
  name: '  John Doe  ',
  email: '  [email protected]  ',
  age: 30,
  isActive: true
};

const cleanedInput = trimStringProperties(userInput);

console.log(cleanedInput);
// Output: { name: 'John Doe', email: '[email protected]', age: 30, isActive: true }

trimStringProperties Source Code

export function trimStringProperties<T extends Record<string, unknown>>(obj: T): T {
  const result = {} as T;

  for (const key in obj) {
    if (Object.prototype.hasOwnProperty.call(obj, key)) {
      const value = obj[key];
      if (typeof value === 'string') {
        result[key as keyof T] = value.trim() as T[keyof T];
      } else {
        result[key as keyof T] = value as T[keyof T];
      }
    }
  }

  return result;
}

Truncate Text

This function truncates a string to a specified length and appends an ellipsis (...) if the string exceeds that length. It also ensures that the string does not end with a space before the ellipsis.

truncateText Example

import { truncateText } from 'ez-funcs';

const text 'Imagine this is super long text that needs to be truncated';

const truncatedText = truncateText(text, 20);

console.log(truncatedText); // Output: Imagine this is super long...

truncateText Source Code

export function truncateText(text: string, length: number) {
  if (text.length <= length) {
    return text;
  }
  return text.slice(0, length) + '...';
}

Try Catch

This function executes a given function and catches any errors that occur in a much more elegant way than the built in try-catch functionality. It returns an object with the result or error. This functions exists in every project I create and I highly recommend using it. However, if you have came up with a better solution please send it my way! Also, I am not going to try to take credit for this one this comes from Theo, if you don't watch his YouTube videos maybe give them a shot! https://www.youtube.com/@t3dotgg.

tryCatch Example

import { tryCatch } from 'ez-funcs';

async function something() {
  const { data, error } = await tryCatch(async () => {
    const response = await fetch('/api/some-endpoint');
    return response.json();
  });

  if (error) {
    console.error('Error fetching data:', error);
  } else {
    console.log('Fetched data:', data);
  }
}

tryCatch Source Code

// Types for the result object with discriminated union
type Success<T> = {
  data: T;
  error: null;
};

type Failure<E> = {
  data: null;
  error: E;
};

type Result<T, E = Error> = Success<T> | Failure<E>;

// Main wrapper function
export async function tryCatch<T, E = Error>(
  promise: Promise<T>
): Promise<Result<T, E>> {
  try {
    const data = await promise;
    return { data, error: null };
  } catch (error) {
    return { data: null, error: error as E };
  }
}

If you have any suggestions visit the contact me page on my website! -> Contact Me