a-toolbox

javascript lightweight basic tools for node.js and browser

Purpose

"This is my rifle. There are many others like it, but this one is mine."

Install

npm i a-toolbox --save

Quick start

const tools = require('a-toolbox')

tools.string.trim('({cut these brackets please)}', ['{', '}', '(', ')'])
// > 'cut these brackets please'

modular import

const tools = {
  string: require('a-toolbox/string'),
  fs: require('a-toolbox/fs')
}

On browser

<script src="node_modules/a-toolbox/dist/atoolbox.min.js"></script>
<script>
var data = {
  name: 'Alice',
  year: 2014,
  color: 'purple'
};

var str = '<div>My name is {name} I was born in {year} and my favourite color is {color}</div>{nothing}';
console.log('template:', tools.string.template(str, data));

//> template: <div>My name is Alice I was born in 2014 and my favourite color is purple</div>{nothing}
</script>

API

• array
• fs
• hash
• object
• util
• random
• string
• sys
• time
• task
• event

array

array.remove(array, item)

• array <Array<*>>
• item <*>

remove an element from array it removes only the first occurrence

Example

let a = ['js','ruby','python']
tools.array.remove(a, 'ruby')
// > a = ['js','python']

array.removeAt(array, index)

• array <Array<*>>
• index <number>

remove an element from array at position

Example

let a = [1,2,3]
tools.array.removeAt(a, 0)
// > a = [2,3]

array.last(array)

• array <Array<*>>
• return: * last element of the array or undefined

get last element of array or undefined

Example

tools.array.last([1,2,3])
// > 3

array.at(array)

• array <Array<*>>
• return: * nth element of array; if negative, start from end: -1 = last element; undefined if missing

get nth element of array

Example

tools.array.at([1,2,3], 0)
// > 1

array.first(array)

• array <Array<*>>
• return: * first element of the array or undefined

get first element of array or undefined

Example

tools.array.first([1,2,3])
// > 1

array.contains(array, item)

• array <Array<*>>
• item <*>
• return: boolean

check if array contains an element

Example

tools.array.contains([1,2,3], 1)
// > true

array.insert(array, index, item)

• array <Array<*>>
• index <number>
• item <*>

insert an item into array at index position

Example

let a = ['john','alice','bob']
tools.array.insert(a, 0, 'mary')
// > a = ['mary', 'john', 'alice', 'bob']

array.concat(arrays)

• arrays <...Array<*>> to chain
• return: Array<*> chained arrays

concat arrays

Example

tools.array.concat([0,1,2],[3,4,5])
// > [0,1,2,3,4,5]

array.empty()

empty array - need to keep references

Example

let a = [0,1,2]
tools.array.empty(a)
// > a = []

array.add(array, item, [unique=false])

• array <Array<*>>
• item <*>
• [unique=false] <boolean>

push item into array, optionally check if already exists

Example

let a = [0,1,2,3]
tools.array.add(a, 3, true)
// > a = [0,1,2,3]

array.flat(array)

• array <Array<*>>
• return: Array<*> flatten array

creates a new array with all sub-array elements concatted into it recursively like Array.prototype.flatten()

Example

let a = [0,[1,2],[3]] >
tools.array.flat(a)
// > [0,1,2,3]

array.sortingInsert(array_, item)

• array_ <Array<*>>
• item <*>
  insert an element in a sorted array, keeping sorted

Example

let a = [0,1,2,10,11,20]
tools.array.sortingInsert(a, 15)
// > a = [0,1,2,10,11,15,20]

array.binaryIndexOf(array, item)

• array <Array<*>>

• item <*>

• return: number index of element of -1 like Array.indexOf but perform binary search (array should be sorted)

Example

tools.array.binaryIndexOf([0,1,2,3], 0)
// > 0

fs

note: not available on browser

fs.exists(path)

• path <string> path
• return: Promise.<boolean> true if file or directory exists

replace deprecated fs.exists

Example

tools.fs.exists('/tmp/file')
// > true

fs.isFile(path)

• path <string> file path
• return: Promise.<boolean> true if it exists and is a file

Example

tools.fs.isFile('/tmp/file')
// > true

fs.isDirectory(path)

• path <string> dir path
• return: Promise.<boolean> true if it exists and is a dir

Example

tools.fs.isDirectory('/tmp')
// > true

fs.touch(path, [mode=0o666])

• path <string> file path
• [mode=0o666] <number>
• return: Promise.<void>

create an empty file if not exists

Example

tools.fs.touch('/tmp/touch-me')

fs.unlink(path, [safe=true])

• path <string> file path
• [safe=true] <boolean> if safe do not throw exception
• return: Promise.<void>

delete file, optionally in safe mode

Example

tools.fs.unlink('/tmp/file')

hash

hash.sha256(data)

• data <string> any string
• return: string sha256 in hex format

Generate hash using sha256 in hex format

Example

tools.hash.sha256('usk6fgbuygbu6')
// > 'ee42f619919727584b66fe25248ed4bba8e87dcfb3e62a90143ea17ba48df58e'

object

object.flat(obj)

• obj <Object>
• return: Object

flat keys in object

Example

tools.object.flat({ a: { a1: 1, a2: 2 }, b: 3 })
// > { 'a.a1': 1, 'a.a2': 2, 'b': 3 }

object.merge(a, b)

• a <Object>
• b <Object>

merge b into a

Example

let a = {a:1,b:'ciao'}
tools.object.merge(a, {a:4,c:{d:8,e:9}})
// > a = { a: 4, b: 'ciao', c: { d: 8, e: 9 } }

object.clone(obj)

• obj <Object|Array> The array or the object to clone
• return: Object|Array

Clone an array or an object in input

Example

tools.object.clone({a: 1, b: 'ciao'})
// > {a: 1, b: 'ciao'}

object.getKeys(obj)

• obj <Object>

• return: Array<string>

Example

tools.object.getKeys({a: () => { }, b: 1, c: 'ciao'})
// > ['a','b','c']

object.inherits(destination, source)

• destination <Object>
• source <Object>

it use Object.getOwnPropertyNames to inherits child from parent, without prototype

Example

let a = {}
tools.object.inherits(a, {f0:() => { },p1:1,p2:'ciao'})
// > a = {f0: () => { }, p1: 1, p2: 'ciao'}

object.empty(obj)

• obj <Object>

empty object - need to keep references

Example

let a = {a:0,b:1,c:2,d:[],e:{f:-1}}
tools.object.empty(a)
// > a = {}

object.raise(flat)

• flat <Object>
• return: Object

restore flat object

Example

tools.object.raise({ 'a.a1': 1, 'a.a2': 2, 'b': 3 })
// > { a: { a1: 1, a2: 2 }, b: 3 }

object.getByFlatKey(obj, fkey)

• obj <Object>
• fkey <string>
• return: Object

get value in object using a flat key

Example

tools.object.getByFlatKey({ a: { b: {c: 1} } }, 'a.b.c')
// > 1

tools.object.getByFlatKey({ a: { b: [{c: 1}] } }, 'a.b[0].c')
// > 1

object.setByFlatKey(obj, fkey, val)

• obj <Object>
• fkey <string>
• val <*>

set value in object using a flat key

Example

let a = {}
tools.object.setByFlatKey(a, 'a.b.c', 1)
// > a = { a: { b: {c: 1} } }

let a = {}
tools.object.setByFlatKey(a, 'a.b[0].c', 1)
// > a = { a: { b: [{c: 1}] } }

util

util.isSet(val)

• val <*>
• return: bool

check if val is setted, means it's not null or undefined

util.onBrowser()

• return: bool

check if you are on browser or not

string

string.template(str, obj, [remove=false])

• str <string>
• obj <Object>
• [remove=false] <boolean> remove missing placeholders from obj, default false
• return: string

replace placeholders inside graph brackets {} with obj dictionary ~ES6 template string without $

Example

tools.string.template('hi {name} how are you?', {name: 'Alice'})
// > 'hi Alice how are you?'

string.trim(str, cuts)

• str <string>
• cuts <Array>
• return: string

trim string

Example

tools.string.trim(' regular trim      ')
// > 'regular trim'

string.replaceAll(str, from, to)

• str <string>
• from <string>
• to <string>
• return: string

Example

tools.string.replaceAll('abcadaeafaga', 'a', '')
// > 'bcdefg'

string.capitalize(str)

• str <string>

• return: string

Example

tools.string.capitalize('alice')
// > 'Alice'

string.prependMissing(prefix, str)

• prefix <string>

• str <string>

• return: string

Example

tools.string.prependMissing('miss ', 'Alice')
// > 'miss Alice'

random

random.rnd(max)

• max <number>
• return: number

get random int from 0 to max

Example

tools.random.rnd(10)
// > 5

random.number(min, max)

• min <number>
• max <number>
• return: number

get random int from min to max

Example

tools.random.number(10, 20)
// > 11

random.string([length=8], [set=abcdefghijklmnopqrstuvwxyz])

• [length=8] <number>
• [set=abcdefghijklmnopqrstuvwxyz] <Array>
• return: string

get random string

Example

tools.random.string(8)
// > 'ajdsfchakwt'

random.hex([length=8])

• [length=8] <number>
• return: string

get random hex string

Example

tools.random.hex(8)
// > '1bc956bf'

random.hash(salt)

• salt <?string>
• return: string

get random hash string

Example

tools.random.hash()
// > '1f8a690b7366a2323e2d5b045120da7e93896f471f8a690b731f8a690b739ab5'

random.element(array, not)

• array <Array<*>>
• not <Array<*>>
• return: * element

get random element from array

Example

tools.random.element([1,2,3,4,5])
// > 1

sys

note: not available on browser

sys.isRoot()

• return: bool is root or not

check if running user is root

time

time.chrono.set([tag=chrono])

• [tag=chrono] <string>

start a timer identified by tag

Example

tools.time.chrono.set('query')

time.chrono.reset([tag=chrono])

• [tag=chrono] <string>

reset the timer identified by tag

Example

tools.time.chrono.reset('query')

time.chrono.clear([tag=chrono])

• [tag=chrono] <string>

discard the timer identified by tag

Example

tools.time.chrono.clear('query')

time.chrono.get([tag=chrono])

• [tag=chrono] <string>
• return: number ms

get the timer in ms from start (or reset) identified by tag

Example

tools.time.chrono.get('query')
// > 11

time.gc()

clear timers (if you care about memory)

task

class task.Worker(options)

• options <Object>
• options.done <function> callback when all tasks are completed simple parallel tasks manager

Example

const tasks = new tools.task.Worker({done: () => { console.log('well done') }})

const _asyncOperationTimeout = [500, 1000, 200, 1500, 100];

for (const i in _asyncOperationTimeout) {
  _tasks.todo('task#' + i);
}

for (const i in _asyncOperationTimeout) {
  setTimeout(function (i) {
    return function () {
      console.log('done task #', i);
      _tasks.done('task#' + i);
    };
  }(i), _asyncOperationTimeout[i]);
}

Worker.todo()

add task

Example

tasks.todo('task#1')

Worker.done()

declare task it's done

Example

tasks.todo('task#1')

event

class event.Emitter()

simple event emitter

Example

const emitter = new tools.event.Emitter()

emitter.on('event#0', (value0, value1) => {
  console.log('event #0 happened with', value0, value1)
})

emitter.once('event#0', (value0, value1) => {
  console.log('event #0 happened (once) with', value0, value1)
})

emitter.emit('event#0', 1, 2)
emitter.emit('event#0', 3, 4)

emitter.off('event#0')

Emitter.emit(name, ...values)

• name <string> event name
• ...values <*> values to pass to the event listener

emit an event

Example

event.emit('event#0', 'a value', 99, {another: 'VALUE'})

Emitter.on(name, callback)

• name <string> event name
• callback <function>

listen to an event

Example

emitter.on('event#0', (value0, value1) => {
  console.log('event #0 happened (once) with', value0, value1)
})

Emitter.once(name, callback)

• name <string> event name
• callback <function>

listen to an event only once

Example

emitter.once('event#0', (value0, value1) => {
  console.log('event #0 happened (once) with', value0, value1)
})

Emitter.off(name)

• name <string> event name

stop listening to an event

Example

emitter.off('event#0')

Changelog

v. 1.7.2

• add object.getByFlatKey support also Array

v. 1.7.1

• add fs.isFile and fs.isDirectory

v. 1.6.2

• fs.exists return true on files and directories, instead of only files

v. 1.5.1

• string.template support multi-level syntax object

v. 1.5.1

• object.setByFlatKey support also Array

v. 1.5.0

• add event.Emitter (simple event emitter, for browser)

v. 1.2.0

• use hash.js instead of crypto (for browser)

v. 1.0.0

• general review
• modular loader
• browser version

TODO

• [ ] string.caseCamel, string.casePascal
• [ ] object.walk test, doc
• [ ] travis CI / node, browser
• [ ] coverage badge / coverage 100%

License

The MIT License (MIT)

Copyright (c) 2015-2019, braces lab

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.