Node.js script.runInNewContext() Method
The script.runInNewContext() method first contextifies the stated contextObject, runs the compiled code inside the vm.Script object within the context created and then returns the output. However, the running code has no access to the local scope.
Syntax:
script.runInNewContext( contextObject, options )
Parameters: This method accept two parameters as mentioned above and described below:
Return Value: It returns the result of the very last statement executed in the script.
Below examples illustrate the use of script.runInNewContext() method in Node.js:
Example 1:
const util = require( 'util' );
const vm = require( 'vm' );
const context = { x: 3, y:4 };
const script = new vm.Script( 'x *=11, y *=4;' );
script.runInNewContext(context);
console.log( "The output is: " , context);
|
Output:
The output is: { x: 33, y: 16 }
Example 2:
const util = require( 'util' );
const vm = require( 'vm' );
cont = {
      animal: 'dog' ,
total_number: 5
    };
var script = vm.createScript(
'total_number += 5; name = "Sheru"' , 'file.vm' );
script.runInNewContext(cont);
Â
console.log(cont);
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Output:
{ animal: 'dog', total_number: 10, name: 'Sheru' }
Reference: https://nodejs.org/api/vm.html#vm_script_runinnewcontext_contextobject_options
Last Updated :
11 Oct, 2021
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