util.js

function searchObjectInArray(array, object, arrayField) {
    for (let i = 0; i < array.length; i++) {
        if (array[i][arrayField] == object) {
            return array[i];
        }
    }
    return undefined;
}

function getObjectsArray2inArray1(array1, fieldArray1, array2, fieldArray2) {
    let ret = [];
    for (let i = 0; i < array1.length; i++) {
        for (let j = 0; j < array2.length; j++) {
            if (array1[i][fieldArray1] == array2[j][fieldArray2]) {
                ret.push(array2[j]);
            }
        }
    }
    return ret;
}

function getBestInArray(array, arrayField, f) {
    let ret = array[0];
    for (let i = 1; i < array.length; i++) {
        if (f(array[i][arrayField], ret[arrayField]) > 0) {
            ret = array[i];
        }
    }
    return ret;
}

function getNumItemInArray(array, field, f) {
    if (Array.isArray(field) && Array.isArray(f) && f.length == field.length) {
        for (let i = 0; i < array.length; i++) {
            let ok = true;
            for (let j = 0; j < field.length; j++) {
                if (array[i][field[j]] != f[j]) {
                    ok = false;
                    break;
                }
            }
            if (ok) {
                return i;
            }
        }
    } else {
        for (let i = 0; i < array.length; i++) {
            if (array[i][field] == f) {
                return i;
            }
        }
    }
    return undefined;
}

module.exports = { getObjectsArray2inArray1, searchObjectInArray, getBestInArray, getNumItemInArray };