Glossary Index

JavaScript

JavaScript is a programming language used to implement interactive behavior in web pages and in non-browser runtimes.

JavaScript engine

JavaScript engines are interpreters that parse and execute JavaScript code.

Jitter

Jitter is the term used in computer networking to refer to packet delay variation — the variance in the rate at which packets arrive at a destination (the average of the squared difference from the mean packet arrival rate).

JPEG

JPEG (Joint Photographic Experts Group) is a commonly used method of lossy compression for digital images.

JSON

JavaScript Object Notation (JSON) is a data-interchange format.

JSON.isRawJSON()

The JSON.isRawJSON() static method tests whether a value is an object returned by JSON.rawJSON().

JSON.parse()

The JSON.parse() static method parses a JSON string, constructing the JavaScript value or object described by the string.

JSON.rawJSON()

The JSON.rawJSON() static method creates a "raw JSON" object containing a piece of JSON text.

JSON.stringify()

The JSON.stringify() static method converts a JavaScript value to a JSON string, optionally replacing values if a replacer function is specified or optionally including only the specified properties if a replacer array is specified.

JSON type representation

JSON is a convenient and widely used format for serializing objects, arrays, numbers, strings, booleans, and null.

json_decode()

json_decode() — Decodes a JSON string.

json_encode()

json_encode() — Returns the JSON representation of a value.

json_validate()

json_validate() — Checks if a string contains valid JSON.

Just-In-Time Compilation (JIT)

JIT (Just-In-Time Compilation) is a compilation process in which code is translated from an intermediate representation or a higher-level language (e.g., JavaScript or Java bytecode) into machine code at runtime, rather than prior to execution.

justify-content

The CSS justify-content property defines how the browser distributes space between and around content items along the main axis of a flex container and the inline axis of grid and multicol containers.

justify-items

The CSS justify-items property defines the default justify-self for all items of the box, giving them all a default way of justifying each box along the appropriate axis.

justify-self

The CSS justify-self property sets the way a box is justified inside its alignment container along the appropriate axis.