util.js

"use strict"

var Util = Object.create({}, {
    isDefined: { value: function(aValue) {
        return !this.isUndefined(aValue);
    }},
    isUndefined: { value: function(aValue) {
        return (aValue === undefined);
    }},
    isA: { value: function(aValue, aType) {
        return (aValue instanceof aType);
    }},
    isString: { value: function(aValue) {
        return (typeof aValue === 'string');
    }},
    isNumber: { value: function(aValue) {
        return (typeof aValue === 'number');
    }},
    isObject: { value: function(aValue) {
        return this.isA(aValue, Object);
    }},
    isArray: { value: function(aValue) {
        return Array.isArray(aValue);
    }},
    inArray: { value: function(aValue, anArray) {
        if (this.isArray(anArray)) {
            return anArray.some(value => value == aValue);
        }
        return false;
    }}
});