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

The Interactive Extensions for JavaScript

/**
 * Returns the element at a specified index in a sequence or undefined if the index is out of range.
 * @param {Iterable<T>} source The source sequence.
 * @param {number} index The zero-based index of the element to retrieve.
 * @return {T} undefined if the index is outside the bounds of the source sequence; otherwise, the element at the
 * specified position in the source sequence.
 */
export function elementAt(source, index) {
    let i = index;
    for (const item of source) {
        if (i === 0) {
            return item;
        }
        i--;
    }
    return undefined;
}

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