rename-function

rename-function

Rename a given function. Tries to be cross-platform and guaranteed. Useful when you want to preserve name of bound function. In bonus, allows passing context to the renamed function.

Install

npm i rename-function --save

How it works? Strategy. Name priority.

There's a couple of things that you should be aware off and make your attention, few scenarios - you can do few things with package like this - rename function, binding function with context and both together.

• Just rename given fn to have name instead of original name.
• Throw TypeError if given fn not a function.
• If only fn is given, it is returned without modifications - nothing done.
• If fn is given and falsey name (meaning non-string) - just returns the fn - nothing done.
• If fn is given and name is same as original name - just returns the fn - nothing done.
• If fn, name and ctx is given, and name is as original - returns function with ctx and same name.
• If fn and ctx is given, then function remains the same - only ctx is bound.

Meaning, this package try to follow native behaviours. Because you can't do such thing

function zooparks () { return this }

var boundOne = renameFunction(zooparks, {foo: 'one'})
var boundTwo = renameFunction(boundOne, {foo: 'two'})
var boundZzz = renameFunction(boundTwo, {foo: 'zzz'})

console.log(boundZzz()) // => {foo: 'one'}

and expect boundZzz() to return {foo: 'zzz'}, it would be {foo: 'one'} always. It's still a bit strange even to me, because of use the thing that I call "smart binding" with which I tried to solve this problem and will continue. Kinda strange, when debugging it seems it shows expected results. But in other hand that's the native behaviour, see this one:

function zooparks () { return this }

var boundOne = zooparks.bind({foo: 'one'})
var boundTwo = boundOne.bind({foo: 'two'})
var boundZzz = boundTwo.bind({foo: 'zzz'})

console.log(boundZzz()) // => {foo: 'one'}

Usage

For more use-cases see the tests

const renameFunction = require('rename-function')

renameFunction

Rename given fn with name. If given name is same as old, then the fn is just returned earlier, nothing more is done.

Params

• fn {Function}
• name {String|Object}
• ctx {Object}
• returns {Function}: or throws TypeError if fn not a function

Example

var rename = require('rename-function')
var getName = require('get-fn-name')

var fn = rename(fixture () {}, 'abc')

console.log(getName(fn)) // => 'abc'
console.log(fn.name) // => 'abc'

// passing context
var bound = rename(fixture foo () { return this }, 'zoo', {a: 'b'})
console.log(bound()) // => {a: 'b'}
console.log(bound.name) // => 'zoo'
console.log(getName(bound)) // => 'zoo'

Related

• bind-context: Bind context to a function and preserves her name. Can be used… more | homepage
• function-arguments: Get arguments of a function, useful for and used in dependency injectors.… more | homepage
• is-async-function: Is function really asynchronous function? Trying to guess that based on check… more | homepage
• is-bound-function: Check if given function is bound or not. | homepage
• is-callback-function: Returns true if function is a callback. Checks its name is one… more | homepage
• parse-function: Parse a function, arrow function or string to object with name, args,… more | homepage
• smart-bind: Smarter binding of function with some context. It uses .apply instead of… more | homepage

Contributing

Pull requests and stars are always welcome. For bugs and feature requests, please create an issue.
But before doing anything, please read the CONTRIBUTING.md guidelines.

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