helper-fns

helper-fns

JavaScript Utilities

INSTALLAION

npm i helper-fns
yarn add helper-fns

Common JavaScript packages and utilities used across my projects.

isEmpty

Checks if the a value is an empty object/collection, has no enumerable properties or is any type that is not considered a collection.

isEmpty([]); // true
isEmpty({}); // true
isEmpty(''); // true
isEmpty([1, 2]); // false
isEmpty({ a: 1, b: 2 }); // false
isEmpty('text'); // false
isEmpty(123); // false - type is not considered a collection
isEmpty(true); // false

pick

Picks the key-value pairs corresponding to the given keys from an object.

pick({ a: 1, b: '2', c: 3 }, ['a', 'c']); // { 'a': 1, 'c': 3 }

omit

Omits the key-value pairs corresponding to the given keys from an object.

omit({ a: 1, b: '2', c: 3 }, ['b']); // { 'a': 1, 'c': 3 }

sumOfAnArray

Calculates the sum of two or more numbers/arrays.

sumOfAnArray(1, 2, 3, 4); // 10

memoize

Returns the memoized (cached) function.

// See the `anagrams` snippet.
const anagramsCached = memoize(anagrams);
anagramsCached('javascript'); // takes a long time
anagramsCached('javascript'); // returns virtually instantly since it's cached
console.log(anagramsCached.cache); // The cached anagrams map

pipeFunctions

Performs left-to-right function composition.

const add5 = x => x + 5;
const multiply = (x, y) => x * y;
const multiplyAndAdd5 = pipeFunctions(multiply, add5);
multiplyAndAdd5(5, 2); // 15

renameKeys

Replaces the names of multiple object keys with the values provided.

const obj = { name: 'Bobo', job: 'Front-End Master', shoeSize: 100 };
renameKeys({ name: 'firstName', job: 'passion' }, obj);
// { firstName: 'Bobo', passion: 'Front-End Master', shoeSize: 100 }

objectArrayToArray

Creates an array of key-value pair arrays from an object.

objectToEntries({ a: 1, b: 2 }); // [ ['a', 1], ['b', 2] ]

clone

Creates a shallow clone of value.

var objects = [{ a: 1 }, { b: 2 }];

var shallow = clone(objects);
console.log(shallow[0] === objects[0]);

difference

Calculates the difference between two arrays, without filtering duplicate values.

difference([1, 2, 3, 3], [1, 2, 4]); // [3, 3]

union

Returns every element that exists in any of the two arrays at least once.

union([1, 2, 3], [4, 3, 2]); // [1, 2, 3, 4]

isDate

Checks if gicen string is date

console.log(isDate('not-date'));
// false

console.log(isDate('2019-01-10'));
// true

groupBy

Groups the elements of an array based on the given function.

groupBy([6.1, 4.2, 6.3], Math.floor); // {4: [4.2], 6: [6.1, 6.3]}
groupBy(['one', 'two', 'three'], 'length'); // {3: ['one', 'two'], 5: ['three']}

orderBy

Sorts an array of objects, ordered by properties and orders.

const users = [
	{ name: 'fred', age: 48 },
	{ name: 'barney', age: 36 },
	{ name: 'fred', age: 40 },
];
orderBy(users, ['name', 'age'], ['asc', 'desc']);
// [{name: 'barney', age: 36}, {name: 'fred', age: 48}, {name: 'fred', age: 40}]
orderBy(users, ['name', 'age']);
// [{name: 'barney', age: 36}, {name: 'fred', age: 40}, {name: 'fred', age: 48}]

randomNumber

Generates random number of between a min number and a max number.

console.log(randomNumber(0,6)); // integer between 0 and 6
// 5

enumToString

Generates random number of between a min number and a max number.

export enum AppRoles {
	AUTHOR = "AUTHOR",
	ADMIN = "ADMIN"
}


console.log(enumToString(AppRoles)); 
// ["AUTHOR", "ADMIN"]

randomString

Generates random string of giben length

console.log(randomString(6));
// a1t4ry

strAfter

Get string after a substring

strAfter('pineapple', 'pine'); // apple

strBefore

Get string before a substring

strBefore('pineapple', 'apple'); // pine

isNotEmpty

Checks if the a value is not an empty object/collectiom

isNotEmpty([]); // false
isNotEmpty({}); // false
isNotEmpty(''); // false
isNotEmpty([1, 2]); // true
isNotEmpty({ a: 1, b: 2 }); // true
isNotEmpty('text'); // true

isObject

Checks if the passed value is an object or not.

isObject([1, 2, 3, 4]); // true
isObject([]); // true
isObject(['Hello!']); // true
isObject({ a: 1 }); // true
isObject({}); // true
isObject(true); // false

fixedDecimal

Get a number after truncating it from the decimal point. No round off is done

fixedDecimal(3.141525, 3); // 3.141

generateRandomString

Get a random string of defined length

generateRandomString(6); // fd84bg

slugify

Generate a slug from a string

slugify('i love javascript'); // i-love-javascript

capitalizeEveryWord

capitalizeEveryWord('hello world!'); // 'Hello World!'

throttle

window.addEventListener(
	'resize',
	throttle(function (evt) {
		console.log(window.innerWidth);
		console.log(window.innerHeight);
	}, 250),
); // Will log the window dimensions at most every 250ms

unescapeHTML

unescapeHTML('<a href="#">Me & you</a>');
// '<a href="#">Me & you</a>'

timeTaken

timeTaken(() => Math.pow(2, 10)); // 1024, (logged): timeTaken: 0.02099609375ms

formatDuration

formatDuration(1001); // '1 second, 1 millisecond'
formatDuration(34325055574);
// '397 days, 6 hours, 44 minutes, 15 seconds, 574 milliseconds'

template

template('Hello, {{name}}!', { name: 'world' });
//=> Hello, world!

template('Howdy, {{0}}! {{1}}', ['partner', '🤠']);
//=> Howdy, partner! 🤠

template('foo: "{{foo}}"; bar: "{{bar}}";', { foo: 123 });
//=> foo: "123"; bar: "";

template(
	`
  Name: {{name.last}}, {{name.first}}
  Location: {{address.city}} ({{address.country}})
  Hobbies: {{hobbies.0}}, {{hobbies.1}}, {{hobbies.2}}
`,
	{
		name: {
			first: 'Luke',
			last: 'Edwards',
		},
		address: {
			city: 'Los Angeles',
			country: 'USA',
		},
		hobbies: ['eat', 'sleep', 'repeat'],
	},
);

encrypt and decrypt

  console.log(encrypt('hello','32 bytes hex key','16 bytes hex iv'))
  // p5HX3eMlroLYJPhXr2zARg==

 console.log(decrypt('p5HX3eMlroLYJPhXr2zARg==','32 bytes hex key','16 bytes hex iv'))
// hello

Contributing

Any types of contributions are welcome. Feel free to send pull requests or create issues.

License

Licensed under The MIT License.