streams/sources/range.js

A lazy streams library for functional composition in JavaScript.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.iteratorRange = iteratorRange;
function iteratorRange(start, end, options) {
    const { step = Math.sign(end - start), inclusive = false } = typeof options === "undefined"
        ? { step: Math.sign(end - start) }
        : typeof options === "number"
            ? { step: options }
            : options;
    if (end != start) {
        if (Math.sign(step) != Math.sign(end - start)) {
            throw new TypeError("step must be in the direction from start to end");
        }
    }
    function* rangeSource() {
        if (step == 0 && inclusive) {
            yield end;
            return;
        }
        const withinRange = end > start || step > 0
            ? inclusive
                ? (i) => i <= end
                : (i) => i < end
            : inclusive
                ? (i) => i >= end
                : (i) => i > end;
        for (let i = start; withinRange(i); i += step) {
            yield i;
        }
    }
    return rangeSource();
}
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