Underscore.JS - wrap method

Syntax

_.wrap(function, wrapper)

wrap method wraps the function with wrapper function such that wrapper executes before and after function execution.

Example

var _ = require('underscore');

var greeting = function(name) { return "hello: " + name + "!"; };

greeting = _.wrap(greeting, function(func) {
  return "Welcome and, " + func("Sam") + ", Bye!";
});
console.log(greeting());

Save the above program in tester.js. Run the following command to execute this program.

Command

\>node tester.js

Output

Welcome and, hello: Sam!, Bye!