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Lodash _.wrap


The lodash _.wrap method is a utility function that takes two arguments: a function and a wrapper function. It returns a new function that wraps the original function in the wrapper function. The wrapper function is called with the same arguments as the original function.

Here is the syntax for the _.wrap method:

_.wrap(func, wrapper)
  • func: The original function to be wrapped.
  • wrapper: The function that will wrap func.

The _.wrap method is useful when you want to modify the behavior of an existing function without modifying its source code. Instead, you can create a new function that adds functionality around the original function.

Here is an example of how you can use _.wrap:

function greeting(name) {
  return `Hello, ${name}!`;

const greetingWrapper = _.wrap(greeting, (func, name) => {
  return `Before greeting: ${func(name)}, After greeting`;

// Output: Before greeting: Hello, John!, After greeting

In the example above, we wrapped the greeting function with a function that adds the phrase "Before greeting:" before the result and "After greeting" after the result. We achieved this by using _.wrap to create a new function that calls greeting internally and adding the extra phrases around its result.

The _.wrap method can be used in many scenarios, for example:

  • Adding default parameters to a function
  • Validating the input of a function
  • Tracking function calls

Overall, the lodash _.wrap method is a handy tool when you want to create a new function that modifies the behavior of an existing function without changing its original code.