ljharb

Array Iteration

https://gist.github.com/ljharb/58faf1cfcb4e6808f74aae4ef7944cff

While attempting to explain JavaScript's reduce method on arrays, conceptually, I came up with the following - hopefully it's helpful; happy to tweak it if anyone has suggestions.

Intro

JavaScript Arrays have lots of built in methods on their prototype. Some of them mutate - ie, they change the underlying array in-place. Luckily, most of them do not - they instead return an entirely distinct array. Since arrays are conceptually a contiguous list of items, it helps code clarity and maintainability a lot to be able to operate on them in a "functional" way. (I'll also insist on referring to an array as a "list" - although in some languages, List is a native data type, in JS and this post, I'm referring to the concept. Everywhere I use the word "list" you can assume I'm talking about a JS Array) This means, to perform a single operation on the list as a whole ("atomically"), and to return a new list - thus making it mu

hibiyasleep

package goddrinksjava;

/**
 * The program GodDrinksJava implements an application that
 * creates an empty simulated world with no meaning or purpose.
 * 
 * @author momocashew
 * @lyrics hibiyasleep
 */
 

McSodbrenner

This is a more precise version of the native setTimeout(). It uses the same parameters as setTimeout, but adds a third parameter "resolution" which defines how often (in ms) to check for the time that passed.

// alert after 5 seconds with an inaccuracy of 20 milliseconds
var timeout = setExactTimeout(function(){
   alert('done');
}, 5000, 20);

// comment out to show "done"
clearExactTimeout(timeout);