mellotron 0.2.6

Synthetic string orchestra. Curated list of string manipulation curried functions

  yarn add mellotron

  npm install mellotron

Methods

capitalize concat contains deburr endsWith format fromQuery fromURL isString isURL join leftPad length match pad replace reverse rightPad slugify split startsWith test toLower toQuery toString toUpper toURL trim trimLeft trimRight

capitalize([string=''])

Capitalize the first letter of a string. From lodash/capitalize

Parameters

Name	Type	Description
string=''	string	The string to convert.	Optional

Examples

capitalize('united states');
// => 'United states'

Returns

• string Returns the capitalized string.

concat([string='', string=''])

Concatenate the given strings. From ramda/concat

Parameters

Name	Type	Description
string=''	string	The first string to add.	Optional
string=''	string	The second string to add.	Optional

Examples

concat('ABC', 'DEF');
// => 'ABCDEF'

const prefix = concat('cyber');
prefix('space');
// => 'cyberspace'

Returns

• string Returns the result of concatenating the given strings.

contains(a, list)

Inserts the separator string between each element and concatenating all the elements into a single string. From ramda/contains

Parameters

Name	Type	Description
a	string	The item to compare against.
list	string	The string to consider

Examples

contains('á', 'Zárate')
// => true

const taco = contains('salsa');
taco('Un taco sin salsa no es taco');
// => true

Returns

• boolean Returns true if an equivalent item is in list, false otherwise.

deburr([string=''])

Deburrs string by converting letters to basic Latin letters and removing combining diacritical marks. From lodash/deburr

Parameters

Name	Type	Description
string=''	string	The string to deburr.	Optional

Examples

deburr('déjà vu');
// => 'deja vu'

Returns

• string Returns the deburred string.

endsWith(target, string)

Checks if string ends with the given target string. From lodash/endsWith

Parameters

Name	Type	Description
target	string	The string to search for.
string	string	The string to inspect.

Examples

endsWith('c', 'abc');
// => true

const endsWithR = endsWith('r');
endsWithR('bar');
// => true

Returns

• boolean Returns true if string ends with target, else false.

format(template, values)

Values are interpolated on a template string.

Parameters

Name	Type	Description
template	string	The `string` with placeholders.
values	Array.<*> Object	Values to be interpolated

Examples

// Allows creating templates:
const readMessages = format('{0}, you have {1} unread message{2}')
readMessages(['Holly', 2, 's'])
// => 'Holly, you have 2 unread messages'

// Unmatched placeholders produce no output:
readMessages(['Steve', 1])
// => 'Steve, you have 1 unread message'

// Supports property access via dot notation
const bobby = { first: 'Bobby', last: 'Fischer' };
const garry = { first: 'Garry', last: 'Kasparov' };
format('{0.first} {0.last} vs. {1.first} {1.last}', [bobby, garry])
// => 'Bobby Fischer vs. Garry Kasparov'

// Supports property access via object property
const jamesBond = { firstname: 'James', lastname: 'Bond' };
format('The name is {lastname}. {firstname} {lastname}.', jamesBond)
// => 'The name is Bond. James Bond.'

Returns

• string Returns the result of replacing each {…} placeholder in the template string with its corresponding replacement.

fromQuery(str[, sep='&', eq='=', options])

Parse a query string into an object. From querystring/parse

Parameters

Name	Type	Description
str	string	The URL query string to parse.
sep='&'	string	The substring to delimit key and value pairs.	Optional
eq='='	string	The substring to delimit keys and values.	Optional
options	Object		Optional

Examples

fromQuery('foo=1&foo=2&foo=3');
// => { foo: ['1', '2', '3' ] }

fromQuery('foo:1|foo:2|foo:3', '|', ':');
// => { foo: ['1', '2', '3' ] }

Returns

• Object Returns the parsed URL query string (str) into a collection of key and value pairs.

fromURL(urlString[, parseQueryString=false, slashesDenoteHost=false])

Parse a query string into an object. Leading ? or # are ignored, so you can pass location.search or location.hash directly. From url/parse

Parameters

Name	Type	Description
urlString	string	The URL string to parse.
parseQueryString=false	boolean	The query property will be set to an object returned by the querystring module's parse() method if `true`.	Optional
slashesDenoteHost=false	boolean	The first token after the literal string // and preceding the next / will be interpreted as the host if `true`.	Optional

Examples

fromURL('https://www.dgmlive.com/kingcrimson/?album=discipline#track-1');
// =>
// {
//   protocol: 'https:',
//   slashes: true,
//   auth: null,
//   host: 'www.dgmlive.com',
//   port: null,
//   hostname: 'www.dgmlive.com',
//   hash: '#track-1',
//   search: '?album=discipline',
//   query: 'album=discipline',
//   pathname: '/kingcrimson/',
//   path: '/kingcrimson/?album=discipline',
//   href: 'https://www.dgmlive.com/kingcrimson/?album=discipline#track-1'
// }

Returns

• Object Returns the parsed URL into a collection of key and value pairs.

isString(val)

See if an object is an instance of the String constructor. From ramda/is

Parameters

Name	Type	Description
val	string	The value to test.

Examples

isString('s');
// => true

isString(new String(''));
// => true

Returns

• boolean Returns if the value is a String.

isURL(string)

Loosely validate a URL. From is-url

Parameters

Name	Type	Description
string	string	The URL string to validate.

Examples

isURL('http://symbolics.com');
// => true

isURL('http://')
// => false

isURL('bbn.com')
// => false

Returns

• Object Returns true if string is a URL, false otherwise.

join(separator, xs)

Inserts the separator string between each element and concatenating all the elements into a single string. From ramda/join

Parameters

Name	Type	Description
separator	string	The string used to separate the elements.
xs	string	The elements to join into a string.

Examples

join(' ', ['a', 2, 3.4]);
// => 'a 2 3.4'

const piper = join('|');
piper(['Pied', 'Piper', 'of', 'Hamelin']);
// => 'Pied|Piper|of|Hamelin'

Returns

• string Returns the string made by concatenating xs with separator.

leftPad(length, string)

Pads string on the left side if it's shorter than length. Padding characters are truncated if they exceed length. From lodash/padStart

Parameters

Name	Type	Description
length	number	The padding length.
string	string	The string to pad.

Examples

leftPad(6, 'abc');
// => '   abc'

Returns

• string Returns the padded string.

length(s)

Count visual length of javascript string. From charcount

Parameters

Name	Type	Description
s	string	The string to count.

Examples

length('🐒🐒🐒🐒🐒🐒🐒🐒🐒🐒🐒🐒');
// => 12

Returns

• number Returns length of the string.

match(rx, str)

Tests a regular expression against a string. From ramda/match

Parameters

Name	Type	Description
rx	string	A regular expression or a substring to match.
str	string	The string to match against.

Examples

match(/([a-z]a)/g, 'bananas');
// => ['ba', 'na', 'na']

Returns

• Array The list of matches or empty array.

pad(length, string)

Pads string on the left and right sides if it's shorter than length. Padding characters are truncated if they can't be evenly divided by length. From lodash/pad

Parameters

Name	Type	Description
length	number	The padding length.
string	string	The string to pad.

Examples

pad(8, 'abc');
// => '  abc   '

Returns

• string Returns the padded string.

replace(regex, replacement, str)

Inserts the separator string between each element and concatenating all the elements into a single string. From ramda/replace

Parameters

Name	Type	Description
regex	string	A regular expression or a substring to match.
replacement	string	The string to replace the matches with.
str	string	The String to do the search and replacement in.

Examples

replace(/foo/g, 'bar', 'foo foo foo');
// => 'bar bar bar'

const censor = replace('the night', 'some time');
censor("Let's spend the night together")
// => "Let's spend some time together"

Returns

• string Returns the resulted string.

reverse(list)

Reverse a string. From ramda/reverse

Parameters

Name	Type	Description
list	string	The string to reverse.

Examples

reverse('stressed');
// => 'desserts'

Returns

• string Returns a new string with the characters in reverse order.

rightPad(length, string)

Pads string on the right side if it's shorter than length. Padding characters are truncated if they exceed length. From lodash/padEnd

Parameters

Name	Type	Description
length	number	The padding length.
string	string	The string to pad.

Examples

rightPad(6, 'abc');
// => 'abc   '

Returns

• string Returns the padded string.

slugify([string=''])

Converts string to kebab case. From lodash/kebabCase

Parameters

Name	Type	Description
string=''	string	The string to convert.	Optional

Examples

slugify('This, That and the Other! An Outré Collection');
// => 'this-that-and-the-other-an-outre-collection'

Returns

• string Returns the kebab cased string.

split(sep, str)

Splits a string into an array of strings based on the given separator. From ramda/split

Parameters

Name	Type	Description
sep	string	The pattern.
str	string	The string to separate into an array.

Examples

const path = split('/');
path('/usr/local/bin/node');
// => ['', 'usr', 'local', 'bin', 'node']

Returns

• Array Returns the resulting array.

startsWith(target, string)

Checks if string starts with the given target string. From lodash/startsWith

Parameters

Name	Type	Description
target	string	The string to search for.
string	string	The string to inspect.

Examples

startsWith('a', 'abc');
// => true

const startsWithM = startsWith('M');
startsWithM('Mellotron');
// => true

Returns

• boolean Returns true if string starts with target, else false.

test(pattern, str)

Determines whether a given string matches a given regular expression. From ramda/test

Parameters

Name	Type	Description
pattern	string	A regular expression or a substring to match.
str	string	The string to match against.

Examples

test(/^x/, 'xyz');
// => true

test(/^y/, 'xyz');
// => false

Returns

• boolean The result of the test.

toLower(str)

Convert to lower case. From ramda/toLower

Parameters

Name	Type	Description
str	string	The string to lower case.

Examples

toLower('XYZ');
// => 'xyz'

Returns

• string Returns the lower case version of str.

toQuery(str[, sep='&', eq='=', options])

Stringify an object into a query string, sorting the keys. From querystring/stringify

Parameters

Name	Type	Description
str	string	The URL query string to parse.
sep='&'	string	The substring to delimit key and value pairs.	Optional
eq='='	string	The substring to delimit keys and values.	Optional
options	Object		Optional

Examples

toQuery({ foo: 'bar', baz: ['qux', 'quux'], corge: '' });
// => 'foo=bar&baz=qux&baz=quux&corge='

toQuery({ foo: 'bar', baz: 'qux' }, '|', ':');
// => foo:bar|baz:qux'

Returns

• Object Returns the parsed URL query string (str) into a collection of key and value pairs.

toString(val)

Convert to string. From ramda/toString

Parameters

Name	Type	Description
val	string	The value to convert.

Examples

toString(42);
// => '42'

toString([1, 2, 3]);
//=> '[1, 2, 3]'

toString({ foo: 1, bar: 2, baz: 3 });
//=> '{"bar": 2, "baz": 3, "foo": 1}'

Returns

• string Returns the string representation of the given value

toUpper(str)

Convert to upper case. From ramda/toUpper

Parameters

Name	Type	Description
str	string	The string to upper case.

Examples

toUpper('abc');
// => 'ABC'

Returns

• string Returns the upper case version of str.

toURL(urlObject)

Convert an url object to URL. From url/format

Parameters

Name	Type	Description
urlObject	Object string	A URL object (as returned by url.parse() or constructed otherwise). If a string, it is converted to an object by passing it to url.parse().

Examples

toURL({
 protocol: 'https',
 host: 'www.dgmlive.com',
 hash: '#track-1',
 query: { album: 'discipline' },
 pathname: '/kingcrimson'
})
// => "https://www.dgmlive.com/kingcrimson?album=discipline#track-1"

Returns

• string Returns the resulted URL.

trim(str)

Removes (strips) whitespace from both ends of the string. From ramda/trim

Parameters

Name	Type	Description
str	string	The string to trim.

Examples

trim('   xyz  ');
// => 'xyz'

Returns

• string Returns the trimmed version of str.

trimLeft([string=''])

Removes leading whitespace or specified characters from string. From lodash/trimStart

Parameters

Name	Type	Description
string=''	string	The string to trim.	Optional

Examples

trimStart('  abc  ');
// => 'abc  '

Returns

• string Returns the trimmed string.

trimRight([string=''])

Removes trailing whitespace or specified characters from string. From lodash/trimEnd

Parameters

Name	Type	Description
string=''	string	The string to trim.	Optional

Examples

trimRight('  abc  ');
// => '  abc'

Returns

• string Returns the trimmed string.