API Reference > bentleyjs-core > Utils Utils Miscellaneous utility classes. Classes Name Description AbandonedError Beta BeDuration A duration of time. BeTimePoint A specific point in time relative to the current time. ByteStream Allows the contents of an ArrayBuffer ClientRequestContext Provides generic context for a server application to get details of a particular DisposableList A disposable container of disposable objects. OneAtATimeAction Orchestrator of a one-at-a-time activity. Beta StopWatch A StopWatch for timing operations. Global Functions Name Description areEqualPossiblyUndefined Compare two possibly-undefined values for equality. asInstanceOf Cast obj to an instance of class T, or return undefined if obj is not an instance of class T. assert Asserts that a condition is true, and in development builds throws an error if it is not. base64StringToUint8Array Given a base-64-encoded string, decode it into an array of bytes. compareBooleans compareBooleansOrUndefined compareNumbers compareNumbersOrUndefined comparePossiblyUndefined compareStrings compareStringsOrUndefined compareWithTolerance An OrderedComparator for numbers that treats two numbers as equal if the absolute value of their difference is less than a specified tolerance. dispose Convenience function for disposing of a disposable object that may be undefined. disposeArray Disposes of and empties a list of disposable objects. isIDisposable A type guard that checks whether the given argument implements IDisposable interface isInstanceOf Returns true if obj is an object of class T. using A 'using' function which is a substitution for .NET's using statement. utf8ToString Given an array of bytes containing a utf-8 string, convert to a string. Interfaces Name Description ClientRequestContextProps The properties of ClientRequestContext. IDisposable Interface adopted by a type which has deterministic cleanup logic. SerializedClientRequestContext Serialized format for sending the client request context across the RPC layer SessionProps Properties that identify a session. Namespaces Name Description JsonUtils Utility functions for converting from JSON objects, with default values. Type Aliases Name Description Constructor DisposeFunc Mutable The inverse of TypeScript's Readonly type, producing a type that has all the properties of T with any readonly modifiers removed. OrderedComparator Last Updated: 29 November, 2022