ix/iterable/find.mjs

The Interactive Extensions for JavaScript

/**
 * Returns the value of the first element in the provided iterable that satisfies the provided testing function.
 *
 * @template T The type of the elements in the source sequence.
 * @param {Iterable<T>} source An iterable sequence whose elements to apply the predicate to.
 * @param {FindOptions<T>} options The options for a predicate for filtering, thisArg for binding and AbortSignal for cancellation.
 * @returns {(T | undefined)} The first element that matches the predicate.
 */
export function find(source, options) {
    const { ['thisArg']: thisArg, ['predicate']: predicate } = options;
    let i = 0;
    for (const item of source) {
        if (predicate.call(thisArg, item, i++)) {
            return item;
        }
    }
    return undefined;
}

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