W3cubDocs

IDBFactory.cmp

The cmp() method of the IDBFactory interface compares two values as keys to determine equality and ordering for IndexedDB operations, such as storing and iterating.

Note: This feature is available in Web Workers.

Note: Do not use this method for comparing arbitrary JavaScript values, because many JavaScript values are either not valid IndexedDB keys (booleans and objects, for example) or are treated as equivalent IndexedDB keys (for example, since IndexedDB ignores arrays with non-numeric properties and treats them as empty arrays, so any non-numeric arrays are treated as equivalent). This throws an exception if either of the values is not a valid key.

Syntax

var result = indexedDB.cmp(first, second);

Parameters

first: The first key to compare.
second: The second key to compare.

Return value

An integer that indicates the result of the comparison; the table below lists the possible values and their meanings:

Returned value	Description
-1	1st key is less than the 2nd key
0	1st key is equal to the 2nd key
1	1st key is greater than the 2nd key

Exceptions

This method may raise a DOMException of the following types:

Attribute	Description
`DataError`	One of the supplied keys was not a valid key.

Example

var a = 1;
var b = 2;
var result = window.indexedDB.cmp(a, b);
console.log( "Comparison results: " + result );

Specifications

Specification	Status	Comment
Indexed Database API The definition of 'cmp()' in that specification.	Recommendation
Indexed Database API 2.0 The definition of 'cmp()' in that specification.	Recommendation

Browser compatibilityUpdate compatibility data on GitHub

	Desktop
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari
Basic support	24 24 23 — 24 Prefixed Prefixed Requires the vendor prefix: webkit	12	16 16 10 — 16 Prefixed Prefixed Requires the vendor prefix: moz	10 10 partial	15	7

	Mobile
	Android webview	Chrome for Android	Edge Mobile	Firefox for Android	Opera for Android	iOS Safari	Samsung Internet
Basic support	Yes Yes ? — ? Prefixed Prefixed Requires the vendor prefix: webkit	25	Yes	22	22	8	Yes