slice-foo

Slices foo any way you'd like

Install

$ npm install --save slice-foo

Written in ES6 and uses generators so you'll need Node 6 or a transpiler to use it.

Usage

const sliceFoo = require('slice-foo')
 
sliceFoo.slice([4, 4, 4, 4], '4040414142424343')
//=> ['4040', '4141', '4242', '4343']
 
 
// It's curried so you can do compose functions like
const parseCardNumber = sliceFoo.slice([4, 4, 4, 4])
 
parseCardNumber('4040414142424343')
//=> ['4040', '4141', '4242', '4343']
 
parseCardNumber('4040414142')
//=> ['4040', '4141', '42']
 
parseCardNumber('40404141')
//=> ['4040', '4141']
 
// easily join into the format you'd like
parseCardNumber('4040414142424343').join(' ')
//=> '4040 4141 4242 4343'

• sliceWith functions to specify chunk sizes dynamically, see API.

Read the tests to see how it behaves.

API

Note:

Sliceable: A type that implements .slice (eg. Array and String)

.slice

slice :: [Number] -> Sliceable -> [a]

Slices a sliceable into chunks specified by an array of numbers

const sliceFoo = require('slice-foo')
 
sliceFoo.slice([4, 4, 4, 4], '4040414142424343')
//=> ['4040', '4141', '4242', '4343']

.sliceWith

sliceWith :: (() -> Number) -> Sliceable -> [a]

Slices a sliceable into chunks using a function

const sliceFoo = require('slice-foo')
 
let i = 0
const getChuckSize = () => {
  if (i++ % 2 === 0)
    return 4
  else
    return 2
}
 
sliceFoo.sliceWith(getChuckSize, '4040414142424343')
//=> ['4040', '41', '4142', '42', '4343']

.sliceWithGenerator

sliceWithGenerator :: (function* -> Number) -> Sliceable -> [a]

Slices a sliceable into chunks using a generator

const sliceFoo = require('slice-foo')
 
function* chunkGenerator () {
  let n = 0
  while (n++ < 2)
    yield 4
}
 
sliceFoo.sliceWithGenerator(chunkGenerator, '4040414142424343')
//=> ['4040', '4141']

Why?

I needed a module to format strings and found most modules do too many things. It's built to be useful on it's own and composed into more specific functions. Aaand I wanted to publish my first open source project ☝️

License

MIT © Sindre Seppola