Software Development Terms Beginning with U
Unary Operator in JavaScript
Section titled “Unary Operator in JavaScript”Unary operators are operators that accept only one operand. Typical examples are the typeof and unary plus operators.
Uncontrolled Component in React
Section titled “Uncontrolled Component in React”An uncontrolled component is a component whose local information (state) is declared locally—it is not influenced externally.
undefined in JavaScript
Section titled “undefined in JavaScript”JavaScript automatically assigns undefined to any variable you declare without an initial value.
Unicode
Section titled “Unicode”Unicode is a character encoding organization that assigns code points (unique identification numbers) to virtually all the characters in the world.
Unicode (RegExp)
Section titled “Unicode (RegExp)”Regular expression’s Unicode flag (u) tells the computer to search for Unicode RegExp patterns.
A unit is anything accepted as a gauge for expressing the quantity or size of another thing.
Unit Test (TDD)
Section titled “Unit Test (TDD)”A unit test is a test written to assess the functionality of an independent piece of program.
Unmounting Phase (React)
Section titled “Unmounting Phase (React)”A component’s unmounting phase is when the component’s instance is being removed from the DOM.
unshift() in JavaScript
Section titled “unshift() in JavaScript”unshift() adds its arguments to the beginning of its calling array and returns the calling array’s new length.
Updating Phase (React)
Section titled “Updating Phase (React)”A component’s updating phase is the period when the component instance is being updated.
URL (Uniform Resource Locator)
Section titled “URL (Uniform Resource Locator)”A URL is a website’s specific location on the web.
useContext (React)
Section titled “useContext (React)”useContext (The Context Hook) allows a funtion component to access (consume) a context object’s value.
useEffect (React)
Section titled “useEffect (React)”useEffect (The Effect Hook) allows a function component to perform side effects outside the React ecosystem.
User Interface (UI)
Section titled “User Interface (UI)”A user interface (UI) is a connection mechanism that allows communication between humans and computers.
useRef in React
Section titled “useRef in React”The useRef() method is the React Ref Hook for storing and retrieving values that React should remember, but whose updates shouldn’t trigger a new render.
useState in React
Section titled “useState in React”The useState() method is the React State Hook for storing a specified value in a function component’s memory.
UTF (Unicode Transformation Format) is the algorithm Unicode uses to transform all Unicode code points into their equivalent binary formats.
UTF-8 allows encoding code points into code units of eight bits.
UTF-16
Section titled “UTF-16”UTF-16 allows encoding code points into code units of 16 bits.
UTF-32
Section titled “UTF-32”UTF-32 allows encoding code points into code units of 32 bits.