fpb
v1.2.2
Published
functional lib for function program support
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fpb
fpb.js is a JavaScript library providing functions for your Functional programming
Getting Started
install
Install via npm
npm install fpb
Use && Feature
- 1、Function first
funtion is the first argument
e.g
fpb.filter(x=> x<3, [2,3,4]) //==> [2]
fpb.map(x=> x*2, [2,3,4]) //==> [4, 6, 8]
- 2、Everything is auto curried
fpb.js providing A lot of functions, and Most of them are auto curried , except 'chain', 'reduce', 'reduceRight', 'curry'
e.g
fpb.filter(x=> x<3)( [2,3,4]) //==> [2]
fpb.map(x=> x*2)( [2,3,4]) //==> [4, 6, 8]
fpb.add(1, 2) //=> 3
fpb.add(1)(2) //=> 3
let add = (x, y, z) = x + y + z
let addN = fpb.curry(add)
addN(1)(2)(3) //==> 6
addN()(1)(2)()(3) //==> 6
addN(1, 2)(3) // ==> 6
- 3、compose
you can compose funtions easily. see a huge example
e.g
const every = fpb.every,
values = fpb.values,
add = fpb.add,
filter = fpb.filter,
compose = fpb.compose,
let filterBigThan2 = filter(x => x > 2)
let add10 = add(10)
sum = fpb.sum
let obj = {
a: 1,
b: 2,
c: 3,
d: 4
}
let composeFn = compose(add10, sum, filterBigThan2, values)
composeFn(obj) //==> 17
- 4、chainAble (lazy chain)
the functions in fpb.js also support chain calls, you can also code in OOP style if you like,and all the functions is lazy call, they would not execute until the force functions executed e.g
const stooges1 = [{ name: 'curly', age: 25 }, { name: 'moe', age: 21 }, { name: 'larry', age: 23 }];
const a1 = fpb.chain(stooges1)
.map(function (stooge) { return stooge.name + ' is ' + stooge.age; })
.size()
.log()
.force() //=> 3