ix/iterable/iif.js

The Interactive Extensions for JavaScript

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.iif = void 0;
const defer_js_1 = require("./defer.js");
const empty_js_1 = require("./empty.js");
/**
 * If the specified condition evaluates true, select the thenSource sequence.
 * Otherwise, select the elseSource sequence.
 *
 * @template TSource The type of the elements in the result sequence.
 * @param {(() => boolean)} condition Condition evaluated to decide which sequence to return.
 * @param {Iterable<TSource>} thenSource Sequence returned in case evaluates true.
 * @param {Iterable<TSource>} [elseSource=empty()] Sequence returned in case condition evaluates false.
 * @returns {IterableX<TSource>} thenSource if condition evaluates true; elseSource otherwise.
 */
function iif(fn, thenSource, elseSource = (0, empty_js_1.empty)()) {
    return (0, defer_js_1.defer)(() => (fn() ? thenSource : elseSource));
}
exports.iif = iif;

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