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Informations about the package functions
Dryist Functions
A variety of utility functions for common programming needs.
Installation
The best way to install and use this package is with composer:
Usage
There are several categories of functions:
- algebra - some common functional language utilities
- array - helpers to work with arrays and iterators
- tool - other various tools
All functions have a constant that refers the fully qualified function name. These constants can be used for composed or piped operations.
There are a number of other packages that provide compatible (and/or similar) utility functions, including:
- https://github.com/ihor/Nspl
- https://github.com/krakphp/fn
- https://github.com/lstrojny/functional-php
Any functionality missing in this package can probably be found elsewhere.
Alegbra
always()
Creates a "K combinator" that always returns the original value:
compose()
Creates a "substitution combinator" that composes two callables:
identity()
Always returns the first input:
This function is also aliased as Dryist\id.
invert()
Creates an inverted predicate:
Array
All of the array functions accept iterable variables, including
arrays, iterators, and generators.
count()
Count the number of items in a list or map:
combine()
Combines two lists to create a map:
filter()
Filter a list or map by a predicate of the value:
filterKey()
Filter a list or map by a predicate of the key:
Related functions:
- take
keys()
Read the keys from a map into a list:
map()
Apply a value modifier to a list or map:
mapBoth()
Apply a value modifier to a list or map:
This differs from map() in that the modifier receives both the key and the value.
mapKey()
Apply a key modifier to a list or map:
resolve()
An alias for iterator_to_array.
take()
Take some values from a map by a list of keys:
values()
Read the values of a map into a list:
Tool
make()
Create a modifier that constructs an object.
stringify()
Convert a value to a string, unless it is null.
