@reactivex/ix-esnext-esm/iterable/count.js

The Interactive Extensions for JavaScript

/**
 * Returns a number that represents how many elements in the specified sequence satisfy a condition if present,
 * else the number of items in the collection.
 * @param {Iterable<T>} source A sequence that contains elements to be tested and counted.
 * @param {function(value: T): boolean} [predicate] A function to test each element for a condition.
 */
export function count(source, predicate = () => true) {
    let i = 0;
    for (const item of source) {
        if (predicate(item)) {
            i++;
        }
    }
    return i;
}

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