In a type system, a data type represents a constraint placed upon the interpretation of data, describing representation, interpretation and structure of values or objects stored in computer memory. Value type and reference type in certain computer programming languages, data types are classified as either value types or reference types, where reference types are always implicitly accessed via references, whereas value type variables directly contain the values themselves In 2005, jesse james garrett released a white paper in which he coined the term ajax and described a set of technologies, of which javascript was the backbone, to create web applications where data can be loaded in the background, avoiding the need for full page reloads. In computer science, array is a data type that represents a collection of elements (values or variables), each selected by one or more indices (identifying keys) that can be computed at run time during program execution Such a collection is usually called an array variable or array value [1] by analogy with the mathematical concepts vector and matrix, array types with one and two indices are.
In more ambitious type systems, a variety of constructs, such as variables, expressions, functions, and modules, may be assigned types The data type should preferably be immutable if possible It is common for implementations to handle equality testing, serialization and model binding The strongly typed identifier commonly wraps the data type used as the primary key in the database, such as a string, an integer or universally unique identifier (uuid). Examples are the decimal.decimal or num7.num type of python, and analogous types provided by other. The following outline is provided as an overview of and topical guide to javascript
It was created by brendan eich in 1995
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