fn-select.js

usage

_

the _ functions takes a boolean value as decider, a callback and as many arguments as the callback needs. the return value will be a closure holding the successor of the callback on the decider.

the _ will only be used inside a select or selectFirst function.

schema: _(decider, callback, ...args)

example: _(true, console.log, 'hello ', 'world')

select

the select function will check, if a given decider is true and execute its callback with the given arguments. the return values of the executed callbacks will be returned as array.

the select function itself takes a collection of _ functions as parameters.

example 1

import {_, select} from 'fn-select.js';

select(
  _(false, console.log, '#1'),
  _(true, console.log, '#2'),
  _(true, console.log, '#3.1 ', '#3.2')
);

expected output:

#2
#3.1 #3.2

example 2

import {_, select} from 'fn-select.js';

function add(x, y){
  return x+y;
}

select(
  _(false, add, 1, 2),
  _(true, add, 1, 3),
  _(true, add, 1, 4)
).forEach(res => console.log(res));

expected output:

4
5

selectFirst

the selectFirst function can be used like the selectfunction

the difference is, that selectFirst only executes the first argument, which decider is true

the return value is the callbacks return value or null, if no decider is true