JavaScript is a high level interpreted language.
The latest ECMAScript standard defines eight data types.
All types except objects define immutable values.
| Type | |
|---|---|
| Boolean | Logical entity having a true or false value |
| Number | Double-precision 64-bit binary format IEEE 754 value |
| BigInt | Represent integers with arbitrary precision and beyond the safe integer limit |
| String | Set of unsigned 16-bit integer values used for textual representations |
| Symbol | Unique value used as the key of an Object property |
| Null | null value |
| Undefined | undefined value |
In computer science, an object is a value in memory which is possibly referenced by an identifier.
In JavaScript, objects can be seen as a collection of properties. Properties are identified using key values. A key value is either a String value or a Symbol value. Property values can be values of any type which enables building complex data structures.
A JavaScript object is a mapping between keys and values. Keys are strings or Symbols, and values can be anything.
Functions are regular objects with the additional capability of being callable.
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