Delegatee-last curried functions for great justice

You can use entrust to easily transform methods into a curried, delegatee-last (data-last) form. If you are used to functional programming (FP) paradigms, this makes FP in JS much easier.

Example:

// native map looks like: array.map(fn)
// entrust map looks like: e1(`map`, fn, array)
import {e1} from 'entrust'
const map = e1(`map`) // this takes a function first, and then the data
map(x => x * 2, [1,2,3]) // [2,4,6]

Here's an example of how to apply the same approach to a tertiary function, like reduce:

import {e2} from 'entrust'
// native reduce looks like: array.reduce(fn, initial)
const reduce = e2(`reduce`) // e2(`reduce`, fn, initial, array)
const sum = reduce((a, b) => a + b, 0)
sum([1,2,3]) // 6
sum([1,2,3,4]) // 10
sum([1,2,3,4,5]) // 15

NB: This approach is used extensively in the f-utility module. You may want to take a look at it here.

entrust is built using katsu-curry's curry implementation. However, if you would like to use a different curry implementation, this is easily accomplished using the custom API. This specific technque is used to generate entrust's "debug-mode" export: entrust/debug.js.

API

Table of Contents

• custom
• eN
• eD
• e0
• e1
• e10
• e2
• e3
• e4
• e5
• e6
• e7
• e8
• e9

custom

generate a customized version of entrust's API

Parameters

• curry function a function which curries

Examples

import {custom} from 'entrust'
import curry from 'lodash/fp/curry'
const {e0} = custom(curry)

Returns object raw+ an augmented version of the raw API

eN

invoke a delegated method with arguments as an array. enforces specific arity

Parameters

• n number 0 - 10
• method string a function name on your delegatee
• args Array arguments to pass to your delegatee's method
• delegatee any something with methods

Examples

import {eN} from 'entrust'
eN(0, `toUpperCase`, [], `cool`) // `COOL`
eN(1, `map`, [(x) => x * 2], [1,2,3]) // [2,4,6]
eN(2, `reduce`, [(a, b) => (a + b), 0], [1,2,3]) // 6

Returns any the result of delegating to the method with some arguments

eD

invoke a delegated method with arguments as an array. enforces specific arity Yells at you if you give arguments that don't match the expected arity.

Parameters

• n number 0 - 10
• method string a function name on your delegatee
• args Array arguments to pass to your delegatee's method
• delegatee any something with methods

Examples

import {eD} from 'entrust'
eD(0, `toUpperCase`, [], `cool`) // `COOL`
eD(1, `map`, [(x) => x * 2], [1,2,3]) // [2,4,6]
eD(2, `reduce`, [(a, b) => (a + b), 0], [1,2,3]) // 6
eD(2, `reduce`, [(a, b) => (a + b)], [1, 2, 3]) // throws error

Returns any the result of delegating to the method with some arguments

e0

Parameters

• fn string a function name
• x Object an object

Examples

import {e0} from 'entrust'
const toLowerCase = e0(`toLowerCase`)
toLowerCase(`COOL`) // cool

Returns any

e1

Parameters

• fn string a function name
• a any some parameter
• x Object an object

Examples

import {e1} from 'entrust'
const split = e1(`split`)
split(`:`, `c:o:o:l`) // [`c`,`o`,`o`,`l`]

Returns any

e10

Parameters

• fn string a function name
• a any some parameter
• b any some parameter
• c any some parameter
• d any some parameter
• e any some parameter
• f any some parameter
• g any some parameter
• h any some parameter
• i any some parameter
• j any some parameter
• x Object an object

Returns any

e2

Parameters

• fn string a function name
• a any some parameter
• b any some parameter
• x Object an object

Examples

import {e2} from 'entrust'
const replace = e2(`replace`)
replace(`old`, `new`, `oldnew`) // newnew

Returns any

e3

Parameters

• fn string a function name
• a any some parameter
• b any some parameter
• c any some parameter
• x Object an object

Returns any

e4

Parameters

• fn string a function name
• a any some parameter
• b any some parameter
• c any some parameter
• d any some parameter
• x Object an object

Returns any

e5

Parameters

• fn string a function name
• a any some parameter
• b any some parameter
• c any some parameter
• d any some parameter
• e any some parameter
• x Object an object

Returns any

e6

Parameters

• fn string a function name
• a any some parameter
• b any some parameter
• c any some parameter
• d any some parameter
• e any some parameter
• f any some parameter
• x Object an object

Returns any

e7

Parameters

• fn string a function name
• a any some parameter
• b any some parameter
• c any some parameter
• d any some parameter
• e any some parameter
• f any some parameter
• g any some parameter
• x Object an object

Returns any

e8

Parameters

• fn string a function name
• a any some parameter
• b any some parameter
• c any some parameter
• d any some parameter
• e any some parameter
• f any some parameter
• g any some parameter
• h any some parameter
• x Object an object

Returns any

e9

Parameters

• fn string a function name
• a any some parameter
• b any some parameter
• c any some parameter
• d any some parameter
• e any some parameter
• f any some parameter
• g any some parameter
• h any some parameter
• i any some parameter
• x Object an object

Returns any