axax/esnext/range.js

A library of async iterator extensions for JavaScript including ```map```, ```reduce```, ```filter```, ```flatMap```, ```pipe``` and [more](https://github.com/jamiemccrindle/axax/blob/master/docs/API.md#functions).

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
/**
 * Creates an iterable of numbers (positive and/or negative)
 * progressing from start up to, but not including, end. A step
 * of -1 is used if a negative start is specified without an end
 * or step. If end is not specified, it's set to start with start
 * then set to 0.
 */
async function* range(startOrEnd, end, step = 1) {
    let actualStart;
    let actualEnd;
    if (end === undefined) {
        actualStart = 0;
        actualEnd = startOrEnd;
    }
    else {
        actualStart = startOrEnd;
        actualEnd = end;
    }
    for (let i = actualStart; step > 0 ? i < actualEnd : i > actualEnd; i += step) {
        yield i;
    }
}
exports.range = range;