higher
v1.0.5
Published
Higher order functions for functional programming
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node-higher
Higher order functions for functional programming
Composition of ramda
and lodash
which both offer some similar but different features and paradigms and complementing features that need combining.
higher
follows the paradigm of ramda
in expecting the data on which to operate on is usually supplied last.
Installation
npm install higher --save
Use
const H = require('higher');
H.unless(_.isUndefined, 'test', test);
Functions
unless
What: Wrapper around ramda
unless
function that allows for values to be used instead of functions.
Why: Because writing () => { return 'some value'; }
all the time is awful.
How: H.unless(_.isNull, 'test', value)
(where _
is lodash
) will return either value
if it's not null or otherwise 'test'
string.
ifElse
What: A concrete instance of ramda
ifElse
function that evaluates the given predicate or value and allows values to be used instead of functions.
Why: Because writing H.isFalsy('replacement value', maybeUndefined && maybeUndefined.someMethod())
all the time is lame and this makes the purpose clearer.
How: H.ifElse(maybeUndefined, MaybeUndefinedClass.someMethod, 'replacement value')
(where _
is lodash
) will return either 'replacement value
or the result of MaybeUndefinedClass.someMethod
applied on maybeUndefined
.
ifFalsy
What: Wrapper around unless
that tests the given value for falsy state.
Why: Because writing (x) => { return !!x; }
all the time is tedious.
How: H.ifFalsy('FALSE', '')
returns 'FALSE'
ifNull
What: Wrapper around unless
that tests the given value for null
value.
Why: Because writing unless(_.isNull, ...
all the time is tedious.
How: H.ifNull('<null>', null)
returns '<null>'
coerceFunction
What: Returns either the given function or function returning the given value.
Why: Because it's useful internally and maybe it will be useful externally.
How: H.coerceFunction(123)
will return function returning 123
coerceArray
What: Returns either the given array or the given non-array value within an array.
Why: Because writing x = _.isArray(x) ? x : [x];
destroys neurons and I saw the example in Ramda documentation and loved it.
How: H.coerceArray(123)
will return [123]
isNonEmptyString
What: Returns true if and only if the given value is a non-empty string (even if all the characters are whitespaces)
Why: Because writing _.String(value) && !_.isEmpty(value)
is bound to make you zombie sooner or later (and I want to avoid it).
How: H.isNonEmptyString('')
will return false
whereas H.isNonEmptyString(' ')
will return true
contains
What: Returns true if the given value is part of the given array.
Why: Because writing _.indexOf(array, value) !== -1
is way too long.
How: H.contains(['a', 'b'], 'c')
will return false
whereas H.isNonEmptyString(['a', 'b'], 'a')
will return true
noopIfNotFunction
What: Returns _.noop
if the given value is not a function thus guaranteeing that the returned value is always a function.
Why: Because writing callback = _.isFunction(callback) ? callback : _.noop
has been written one too many times in the history of our Universe.
How: H.noopIfNotFunction(undefined)
will return _.noop
whereas H.noopIfNotFunction(() => undefined)
will return () => undefined
function.