JavaScript data types and data structures

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Programming languages all have built-in data structures, but these often differ from one language to another.

This article attempts to list the built-in data structures available in JavaScript and what properties they have;these can be used to build other data structures.

Wherever possible, comparisons with other languages are drawn.

Dynamic typing

JavaScript is a loosely typed or a dynamic language.

Variables in JavaScript are not directly associated with any particular value type, and any variable can be assigned (and re-assigned) values of all types:

var foo = 42; // foo is now a number
foo = 'bar'; // foo is now a string
foo = true; // foo is now a boolean