NodeJS v8.cachedDataVersionTag() Method

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The NodeJS v8.cachedDataVersionTag() method of the v8 module is used to retrieve an integer value that will represent the version tag of the v8 version, command-line flags, and the detected CPU features. This method is useful while determining whether the vm.script cachedBuffer is compatible with this v8 instance or not.

Syntax

Following is the syntax of the NodeJS v8.cachedDataVersionTag() Method −

v8.cachcedDataVersionTag()

Parameters

This method does not accept any parameters.

Return Value

This method returns an integer that specifies a version tag that is derived from the V8 version, command-line flags, and detected CPU features.

Example

In this example, we are trying to get the versionTag that will be derived from the v8 version, command-line flags, and detected CPU features.

const v8 = require('v8');
console.log("The cachedDataVersion is: "+ v8.cachedDataVersionTag());

Output

After executing the above code, the output will be as follows −

The cachedDataVersion is: 1833143668

Example

The value returned by the v8.cachedDataVersionTag() method will update when the flags are toggled. We can toggle various flags, and each time one is changed, the values are updated.

const v8 = require('v8');
v8.setFlagsFromString('--allow_natives_syntax');
console.log("The cachedDataVersion is after the flags are toggled: "+ v8.cachedDataVersionTag());

Output

As we can see in the output below, the value returned by the v8.cachedDataVersionTag() method is updated.

The cachedDataVersion is after the flags are toggled: 3711483728