/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the MIT License. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/
/**
 * Takes a sorted array and a function p. The array is sorted in such a way that all elements where p(x) is false
 * are located before all elements where p(x) is true.
 * @returns the least x for which p(x) is true or array.length if no element fullfills the given function.
 */
export function findFirst(array, p) {
    let low = 0, high = array.length;
    if (high === 0) {
        return 0; // no children
    }
    while (low < high) {
        let mid = Math.floor((low + high) / 2);
        if (p(array[mid])) {
            high = mid;
        }
        else {
            low = mid + 1;
        }
    }
    return low;
}
export function binarySearch(array, key, comparator) {
    let low = 0, high = array.length - 1;
    while (low <= high) {
        const mid = ((low + high) / 2) | 0;
        const comp = comparator(array[mid], key);
        if (comp < 0) {
            low = mid + 1;
        }
        else if (comp > 0) {
            high = mid - 1;
        }
        else {
            return mid;
        }
    }
    return -(low + 1);
}