linq-extensions/dist/lib/iterables/join/outer-join-iterable.js

Linq-like extension methods for JavaScript and TypeScript builtin collections

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.OuterJoinIterable = void 0;
const iterable_1 = require("../../iterable");
class OuterJoinIterable extends iterable_1.Iterable {
    constructor(left, right, on, into) {
        super();
        this.left = left;
        this.right = right;
        this.on = on;
        this.into = into;
    }
    *[Symbol.iterator]() {
        const unusedRightElements = this.right.toSet();
        for (const left of this.left) {
            let didJoin = false;
            for (const right of this.right) {
                if (this.on(left, right)) {
                    didJoin = true;
                    unusedRightElements.delete(right);
                    yield this.into(left, right);
                }
            }
            if (!didJoin) {
                yield this.into(left, null);
            }
        }
        for (const element of unusedRightElements) {
            yield this.into(null, element);
        }
    }
}
exports.OuterJoinIterable = OuterJoinIterable;
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