ix/iterable/count.js

The Interactive Extensions for JavaScript

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.count = void 0;
/**
 * Returns a promise that represents how many elements in the specified iterable sequence satisfy a condition
 * otherwise, the number of items in the sequence.
 *
 * @template T The type of elements in the source collection.
 * @param {Iterable<T>} source An iterable sequence that contains elements to be counted.
 * @param {OptionalFindOptions<T>} [options] The options for a predicate for filtering and thisArg for binding.
 * @returns {number} The number of matching elements for the given condition if provided, otherwise
 * the number of elements in the sequence.
 */
function count(source, options) {
    const { ['thisArg']: thisArg, ['predicate']: predicate = () => true } = options || {};
    let i = 0;
    for (const item of source) {
        if (predicate.call(thisArg, item, i)) {
            i++;
        }
    }
    return i;
}
exports.count = count;

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