API Reference > core-bentley > 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 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 - when enabled - 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 IDisposable Interface adopted by a type which has deterministic cleanup logic. Type Aliases Name Description AccessToken A string that contains an access token. Beta AsyncFunction AsyncMethodsOf Extracts the names of all function properties of T that return a Promise. Constructor DisposeFunc ExtractLiterals Extracts a subset of literals U from a union of literals T in a type-safe way. Beta MarkRequired Make a new type from an existing type T, with set of optional properties K required. Mutable The inverse of TypeScript's Readonly type, producing a type that has all the properties of T with any readonly modifiers removed. NonFunctionPropertiesOf Produces a type consisting of all of the public properties of T except for those of type function. NonFunctionPropertyNamesOf Extracts the names of all public properties of T that are not of type function. Optional Make a new type from an existing type T, with set of required properties K optional. OrderedComparator PromiseReturnType Extracts the type to which the Promise returned by an async function resolves. Last Updated: 19 August, 2022