snc

Asyncronous Iterators Collection

http://snc.js.gl

INSTALL/DOWNLOAD

http://npmjs.com/package/snc

npm install snc

Node.Js : Import module:

const snc = require("snc")

Web : Import module:

<script src="snc/snc.js"></script>

Http CDN

• http://cdn.js.gl/snc.js
• https://cdn.jsdelivr.net/npm/snc@latest
• https://raw.githubusercontent.com/warlock/snc/master/snc.js
• https://unpkg.com/snc

snc.each(array, callback_loop(item, index, next_method, end_method), callback_end)

Runs next function when "next" method is executed.

const list = ['a', 'b', 'c']

snc.each(list, (item, index, next, end) => {
  console.log(`item: ${item}`)
  setTimeout(next, 3000)
}, () => {
  console.log(`End`)
})

-> item: a // Wait 3 seconds
-> item: b // Wait 3 seconds
-> item: c // Wait 3 seconds
-> End

Call "end" method for break the loop.

const list = ['a', 'b', 'c']

snc.each(list, (item, index, next, end) => {
  console.log(`item: ${item}`)
  setTimeout(() => {
    if (index === 1) end(`Bye!`)
    else next()
  }, 3000)
}, data => {
  if (data) console.log(`End: ${data}`)
  else console.log(`End`)
})

-> item: a // Wait 3 seconds
-> item: b // Wait 3 seconds
-> End: Bye!

snc.eachParallelLimit(array, number_limit, callback_loop(item, index, next_method), callback_end)

Runs in parallel limit and next loop when "next" method is executed. Alternative names: eachpl, epl.

const list = ['a', 'b', 'c', 'd']
snc.epl(list, 2, (item, index, next) => {
  console.log(`item: ${item}`)
  setTimeout(next, 2000)
}, () => {
  console.log(`End`)
})

-> item: a
-> item: b
-> item: c // Next to start when next method executed
-> item: d // Next to start when next method executed
-> End

snc.waterfall(array_functions(done, data), callback_end)

Runs next function when "done" method is executed. Alternative name: wf.

snc.waterfall([
  done => {
    console.log(`fire`)
    done(5)
  },
  (done, data) => {
    console.log(`ice: ${data}`)
    done(`win`)
  }
], data => {
  console.log(`End: ${data}`)
})

-> fire
-> ice: 5
-> End: win

Break the waterfall with "true".

snc.wf([
  done => {
    console.log(`fire`)
    done(true, 5)
  },
  (done, data) => {
    console.log(`ice: ${data}`)
    done(`win`)
  }
], data => {
  console.log(`End: ${data}`)
})

-> fire
-> End: 5

snc.parallel(array_functions(done), callback_end(data))

Run functions in parallel and then execute "callback_end". Alternative name: p.

snc.parallel([
  done => {
    setTimeout(() => {
      console.log(`hi 3!`)
      done(`a`)
    }, 3000)
  },
  done => {
    setTimeout(() => {
      console.log(`hi 2!`)
      done(`b`)
    }, 2000)
  },
  done => {
    setTimeout(() => {
      console.log(`hi 1!`)
      done(`c`)
    }, 1000)
  }
],data => {
  console.log(`End: ${JSON.stringify(data)}`)
})

//Wait 1 second
-> hi 1! //Wait 1 second
-> hi 2! //Wait 1 second
-> hi 3!
-> End: ["a","b","c"]

snc.parallelLimit(number, array_functions(done), callback_end(data))

Run limit of functions in parallel and then execute "callback_end". Alternative name : pl

snc.pl(2, [
  done => {
    setTimeout(() => {
      console.log("go 1!")
      done("a")
    }, 1000)
  },
  done => {
    setTimeout(() => {
      console.log("go 2!")
      done("b")
    }, 3000)
  },
  done => {
    setTimeout(() => {
      console.log("go 3!")
      done("c")
    }, 1000)
  },
  done => {
    setTimeout(() => {
      console.log("go 4!")
      done("a2")
    }, 3000)
  },
  done => {
    setTimeout(() => {
      console.log("go 5!")
      done("b2")
    }, 1000)
  },
  done => {
    setTimeout(() => {
      console.log("go 6!")
      done("c2")
   }, 3000)
  },
  done => {
    setTimeout(() => {
      console.log("go 7!")
      done("a3")
    }, 1000)
  },
  done => {
    setTimeout(() => {
      console.log("go 8!")
      done("b3")
    }, 3000)
  },
  done => {
    setTimeout(() => {
       console.log("go 9!")
       done("c3")
    }, 1000)
  }
],data => {
  console.log(`we: ${JSON.stringify(data)}`)
})

-> go 1!
-> go 3!
-> go 2!
-> go 5!
-> go 4!
-> go 7!
-> go 6!
-> go 9!
-> go 8!
-> we: ["a","b","c","a2","b2","c2","a3","b3","c3"]

snc.forever(callback(repeat, end), callback_end)

Loops syncronous forever. Alternative name: fe.

snc.forever((repeat, end) => {
  console.log(`Hi!`)
  setTimeout(repeat, 3000)
})

-> Hi! // Wait 3 seconds
-> Hi! // Wait 3 seconds
-> ...

Breaking forever loop.

const i = 0
snc.fe((repeat, end) => {
  console.log(`loop: ${i}`)
  if (i>=3) end(`Now Break!!!`)
  i++
  setTimeout(repeat, 3000)
}, data => {
  console.log(`Response: ${data}`)
})

-> loop: 0 // Wait 3 seconds
-> loop: 1 // Wait 3 seconds
-> loop: 2 // Wait 3 seconds
-> loop: 3 // Wait 3 seconds
-> Response: Now Break!!

snc.foreverParallel(limit, callback(counter, done), callback_end(data))

Forever loop with parallel limit. Alternative name: fp.

snc.fp(2, (counter, done, end) => {
  console.log(counter)
  if (counter < 6 ) {
    setTimeout(() => {
      done()
    }, 3000)
  } else end('bye!')
},
data => {
  console.log(`END: ${data}`)
})

-> 1
-> 2
-> 3 // Wait 3 seconds
-> 4 // Wait 3 seconds
-> 5 // Wait 6 seconds
-> 6 // Wait 6 seconds
-> 7 // Wait 9 seconds
-> END: bye bye! // Wait 9 seconds

snc.times(number, callback(index, next, end), end)

Iterates function "number" times.

snc.times(5, (index, next, end) => {
  console.log(`Iterator ${index}`)
  next()
},
() => {
  console.log('End')
})

-> Iterator 0
-> Iterator 1
-> Iterator 2
-> Iterator 3
-> Iterator 4
-> End

snc.for(initial, final, increment, callback(index, next, end), callback_end(data))

Syncronous "for" iterator. Alternative name: forSync.

snc.for(0, 10, 1, (index, next, end) => {
  console.log(index)
  setTimeout(() => {
    next(5)
  }, 1000)
}, data => {
  console.log(`LENGTH: ${data.length} -> ${JSON.stringify(data)}`)
})

-> 0
-> 1
-> 2
-> 3
-> 4
-> 5
-> 6
-> 7
-> 8
-> 9
-> LENGTH: 10 -> [5,5,5,5,5,5,5,5,5,5]

snc.for(1, 10, 2, (index, next, end) => {
  console.log(index)
  setTimeout(() => {
    next(index)
  }, 1000)
}, data => {
  console.log(data)
})

-> 1
-> 3
-> 5
-> 7
-> 9
-> [ 1, 3, 5, 7, 9 ]

snc.all(array, callback(element, done))

Execute all elements in array in parallel. And get all responses in order. Alternative name: map.

snc.all([3,2,1], (element, index, done) => {
  setTimeout(() => {
    console.log(element)
    done(element)
  }, element * 1000)
},
res => {
  console.log(`Reponse: ${JSON.stringify(res)}`)
})

-> 1
-> 2
-> 3
-> [3,2,1]

snc.now(function, callback(data))

Execute now and then execute callback.

snc.now(then => {
  console.log('Now')

  setTimeout(() => {
    then('End...')
  }, 3000)
},
res => {
  console.log(`Reponse: ${JSON.stringify(res)}`)
})

-> Now
-> Response: "End..."

snc.interval(function, end(data))

Execute in time intervals and break with end function.

var i = 0
snc.interval(2000, end => {
  console.log(`Executed: ${new Date()}`)
  i++
  if (i === 3) end('Bye bye')
},
res => {
  console.log(`End: ${res}`)
})

-> Executed: Thu Feb 01 2018 13:54:27 GMT+0100 (CET)
-> Executed: Thu Feb 01 2018 13:54:29 GMT+0100 (CET)
-> Executed: Thu Feb 01 2018 13:54:31 GMT+0100 (CET)
-> Response: "End..."

License

All the code here is under MIT license. Which means you could do virtually anything with the code. I will appreciate it very much if you keep an attribution where appropriate.

The MIT License (MIT) Copyright (c) 2015 Josep Subils ([email protected])

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.