Various functions to check the integrity of data.

Utility Functions.js

function isString(x) {
    return x !== null && x !== undefined && x.constructor === String
}

function isNumber(x) {
    return x !== null && x !== undefined && x.constructor === Number
}

function isBoolean(x) {
    return x !== null && x !== undefined && x.constructor === Boolean
}

function isObject(x) {
    return x !== null && x !== undefined && x.constructor === Object
}

function isArray(x) {
    return x !== null && x !== undefined && x.constructor === Array
}

/* source: https://github.com/realm-demos/realm-scanner/blob/master/Server/index.js */