Type (or data type) is a characteristic of a value affecting what kind of data it can store — for example in JavaScript a Boolean
only holds true
/false
values, whereas a String
holdstext strings, a Number
holds numbers of any kind, etc.
A value's data type also affects which operations are valid on that value. For example, an integer can be multiplied by an integer, but not by a string.
Learn more
General knowledge
- Data type on Wikipedia
- Data types in JavaScript