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Example code of phamda/phamda

Informations about the package phamda

Phamda

Phamda is an auto-curried function library for PHP, heavily inspired by the Javascript library Ramda. PHP 7.0+ or HHVM is required.

Installation

Using composer: composer require phamda/phamda

Documentation

Documentation is available on Read the Docs.

Examples

These examples highlight the major features of Phamda. Basic usage examples can also be found on the function list.

Currying

Nearly all of the functions use automatic partial application or currying. For example you can call the filter function with only the predicate callback and get a new function:

The final result is the same as using two arguments directly. Of course this new function could now be used to filter other lists as well.

It's also possible to create new curried functions, including from native PHP functions. The curry function takes a function and initial parameters and returns a new function:

Composition

Phamda functions are composable. The basic functions can be used to create new, more complex functions. There are also several functions to help with function composition. For example the compose function takes multiple argument functions and returns a new function. Calling this new function applies the argument functions in succession:

Often the pipe function is a more natural way to compose functions. It is similar to compose, but the argument functions are applied in reverse order:

Parameter order

When using functional techniques it's usually most convenient if data is the last parameter. Often native PHP and library functions do not follow for this pattern. Phamda includes some tools to make it easier to use these functions functionally. The simplest is flip, it switches the order of the first two parameters:

twist is somewhat more complicated and will return a new function where the original first parameter is now last:

Using twist may not work well with variadic functions. This is where twistN can be useful. It requires an additional parameter to set the location of the replaced parameter.

All of these functions return curried functions.

Pipelines

Combining these techniques allows the building of function pipelines. In this example they are applied to processing a list of badly formatted product data:

License

MIT license, see LICENSE file.

All versions of phamda with dependencies

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Package Version
Requires php Version >=7.0
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