/**
 * Filter function but instead of returning the element, the function returns the
 * indexes of each element.
 *
 * @param array The array on which the filter function is going to run.
 * @param predicate The function to apply to each element. The function is called with
 * the element, the index, and the whole array.
 * @return An array of indexes
 */
export function filterIndexes(array: any[],
                              predicate: (elt: any,
                                          idx: number,
                                          array: any[]) => boolean): number[] {
    const indexes: number[] = [];
    array.forEach((elt: any, idx: number) => {
        if (predicate(elt, idx, array)) {
            indexes.push(idx);
        }
    });
    return indexes;
}

/**
 * Trim the value if the value is of type string
 * @param value The value to be trimmed (or not)
 * @return The trimmed value
 */
export function smartTrim(value: any): any {
    if (typeof value === 'string') {
        return value.trim();
    }
    return value;
}