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Web-Related Terms Beginning with T

Temporal Dead Zone (JS)

A temporal dead zone (TDZ) is the area of a block where a variable is inaccessible until the moment the computer completely initializes it with a value.

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Terminal

A terminal is a computer's text interface allowing you to type commands for the computer to run.

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Ternary Operator (JS)

A ternary operator is an alternate (shortcut) way of writing an if...else statement.

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Test Doubles (TDD)

Test doubles are the imitation objects used to mimic real dependencies like databases, libraries, networks, and APIs.

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Test Runner

A test runner is a tool developers use to run a test script and print the test's results on the command line (CLI).

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Test-Driven Development

Test-driven development is a coding practice where you write the result you want your program to produce before creating the program.

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test() in JavaScript

test() tests its string argument for an occurrence of a regular expression.

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Text

Text is the characters of a piece of writing.

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Text Markup

Text Markup means Text Note (that is, the note added to a text to help typesetters (or computers) better understand how to present the marked-up text).

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Textual Data

Textual data are the written contents of a page, such as letters (e.g., A, B, C), numbers (e.g., 1, 2, 3), symbols (e.g., $, #, +), and code (e.g., <input>, body { background: #A18A77; }, if (condition) { //execute code }).

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Thenable (JavaScript)

Thenable in JavaScript refers to any object that contains a then() method.

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this (JS)

JavaScript's this keyword refers to the owner object of the keyword's method or the this value of an arrow function's lexical context.

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TO (RegExp)

A regular expression's TO operator ([a-z]) defines the range of characters you wish to find in a single character's position.

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toLowerCase() in JavaScript

toLowerCase() returns the lowercase version of its calling string.

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Top-Level Domain

The top-level domain (TLD) is what follows the domain name in a URL.

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Top-Level Module (JavaScript)

A top-level module is a script containing other modules.

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toString() JavaScript Number Method

toString() converts a number to a string of a specified radix.

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toUpperCase() in JavaScript

toUpperCase() returns the uppercase version of its calling string.

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trim() in JavaScript

trim() trims whitespace from both ends of a string.

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trimEnd() in JavaScript

trimEnd() trims whitespace only at the end of a string.

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trimStart() in JavaScript

trimStart() trims whitespace only at the beginning of a string.

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Truthy (JS)

Truthy values are values JavaScript considers to be true.

All JavaScript's values are true except 0 (zero), false, "" (empty string), NaN, null, undefined, and 0n (BigInt zero)—which are falsy.