functional-javascript | functional programming in JavaScript | Functional Programming library
kandi X-RAY | functional-javascript Summary
kandi X-RAY | functional-javascript Summary
This code, from 2007, is deprecated. I'm keeping it available for historical interest. Some of the ideas in this code and in its companion collections.js were used in Jeremy Ashkenas's Underscore.js, which in turn inspired Lodash. Use those instead. CoffeeScript (aso by Jeremy Ashkenas) and ECMAScript 6 also include arrow functions and functional programming functions such as map. If you use these languages, or many other modern languages that compile into ECMAScript, you can do functional prorammming entirely within the language. Thanks to everyone who has contributed, and to everyone who has thanked me over the years, thank you in turn.
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Lines of Code : 29License : Permissive (MIT License)
Copyfunction _curryN(length, received, fn) {
return function () {
var combined = [];
var argsIdx = 0;
var left = length;
var combinedIdx = 0;
while (combinedIdx < received.length || argsIdx < arguments.length) {
function _dispatchable(methodNames, transducerCreator, fn) {
return function () {
if (arguments.length === 0) {
return fn();
}
var obj = arguments[arguments.length - 1];
if (!_isArray(obj)) {
var idx = 0; function _curry2(fn) {
return function f2(a, b) {
switch (arguments.length) {
case 0:
return f2;
case 1:
return _isPlaceholder(a) ? f2 : _curry1(function (_b) {
return fn(a, _b);
}) Community Discussions
Trending Discussions on functional-javascript
QUESTION
Reading through this article on Javascript Functional Programming and it mentions Referential Transparency being defined as:
Referential transparency: The function always gives the same return value for the same arguments. This means that the function cannot depend on any mutable state.
IIUC Javascript functions satisfy this requirement even if they depend on mutable state, because two functions cannot operate on shared state even if they are running at the same time?
...ANSWER
Answered 2018-Oct-22 at 23:39So to summarize our discussion, yes Javascript functions do have referential transparency as long as the mutable state they depend on does not change.
In other words the same output will be provided for the same input while the mutable state that the function depends on is held constant.
This seems somewhat obvious, but for Javascript and functional programming its an important concept / realization because Javascript cannot run the function in two threads at the same time. If we could change the state that the function depends on while the function is running we could create race conditions that are hard to reason about and that would make the function results unpredictable, which is what we are trying to avoid with referential transparency.
For example a function fn(5), that depends on mutable state x will always return the same result for the same input, as long as x does not change.
In non Javascript environments it's possible to change x while the function is running, so two invocations of fn(5) could return different results.
With Javascript if fn(5) returns a different result, we know exactly why. It's because x was changed between invocations of fn(5).
QUESTION
I drafted a code example to better understand Promise chaining and found myself quite confused about what's going on here.
Let's say we have two variables which store Promises:
...ANSWER
Answered 2018-Apr-24 at 10:39Can someone please explain why it works that way? Is it about how JS initializes variables and somehow connected to the fact that "Promise executes immediately"
Yes, it is exactly because of that. The promise will execute as soon as it is declared so in your case when you declare promise1 it automatically waits for 1 second and promise2 the same. If you want to wait one second after the first action is done you have to declare the promise inside the then block (as you did in the last example). A common practice is to have functions that returns promises:
QUESTION
I have been playing with some code over the last few days and I am trying to get more into functional programming but I am at a road block. I don't understand how to handle an object. Essentially I have an object that I want to add key value pairs to. I understand in function programming you don't reassign you just make a new object with the added key value pair. I was thinking about putting the object in some type of container like 'Box'
...ANSWER
Answered 2017-Dec-31 at 09:58The problem is that your map callback functions return the string (the result of the assignment is the right hand side), not the object whose property they assigned to. You would need to write
QUESTION
I have a really strange situation where PhpStorm doesn't seem to catch my breakpoint unless I start the test with the listen button enabled, then after it starts, I then disable the button.
See screen capture below and config files.
Any ideas on what I might have configured incorrectly?
Here's what PhpStorm displays in the console while it's "hung" -
...ANSWER
Answered 2017-Dec-01 at 20:20Please increase number of max simultaneous debug connections in PhpStorm settings -- by default it's only 1 .. and based on the xdebug log (and after re-checking the pretty poor quality gif animation again) you seem to have some sort of sub-request going on .. which requires separate debug connection ... which IDE cannot accept as it's already reached the limit (of 1). By clicking "stop listening" the first connection is released so IDE can accept 2nd one.
Quite likely it's because of the way how your test code gets executed (PHPUnit settings, for example, although I have not noticed the expected in such case option in PHPUnit config file).
QUESTION
I'm attempting to redefine Javascript's reduce using a recursive function. Here's my attempt, which doesn't work. If anyone can change it only slightly to make it work, that would be great because I'd understand it better. (This is an exercise in functional-javascript-workshop).
...ANSWER
Answered 2017-Apr-25 at 14:49You need to update the accumulator:
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