danspinola

function* enumerate(arr) {
 for (const index in arr) {
   yield [index, arr[index]];
  }
}

danspinola

/**
 * @params manager {{
     source: S,
     open(source: S): R,
     close(resource: R): void,
 }} - An object with a source, and two functions used to connect and clean-up the resource.
 */
function using(manager, cb) {
    const resource = manager.open(manager.source);
    try {

danspinola

function forEach(cb, arr) {
    class Break extends Error {};
    const _break = _ => { throw new Break(); };
    try {
        for (const index in arr) {
            cb(arr[index], index, arr, _break);
        }
    }
    catch (e) {
        if (e instanceof Break) return;

danspinola

function yet(promise) {
    const states = Object.freeze({
        PENDING: "pending",
        FULFILLED: "filfilled",
        REJECTED: "rejected"
    });
    
    const yettable = {
        state: "pending",
        _result: undefined,