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 compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support

24

23 — 24 webkit

12

16

10 — 16 moz

101157
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support

24

23 — 24 webkit

24

23 — 24 webkit

Yes22228 Yes

1. partial

See also

Document Tags and Contributors

Last updated by: fscholz,