prototype-utils

Some utils function about prototype manipulation, mix two class prototypes, create function in which this points to itself, and so on.

This package is developed mainly for personal usage. Use as your own risk.

API

export function insertPrototype<T>(obj: any, newProto: T): T
Make obj's prototype points to newProto, and connect the end of the protochain of newProto to the start of the protochain of the origin prototype of obj.
return the obj.

export function extendPrototype<T>(obj: any, objWithNewProto: T)
Similar to insertPrototype, but:

• objWithNewProto should be a object whose prototype is newProto, rather than pass the prototype directly.
• Properties on objWithNewProto will be copied to obj, by using Object.assign(obj, objWithNewProto)

export function getParamsString(count: number): string
Create a string as p0,p1,p2,...,p_count

export function bindSelf<T extends Function>(fn: T): T
Create a function whose this is bind to itself.
Typically a.f.bind(a) return a new function with this points to the a object, rather than the new function.
With this method, you can create a function which will execute fn with this pointing to the new function itself.
Example:

const {bindSelf} = require("@starrah/prototype-utils")
function example() {
    return this
}
// use `bind` function
const a = example.bind(example)
const thisInA = a()
console.log(thisInA === a) // false
// use `bindSelf`
const b = bindSelf(example)
const thisInB = b()
console.log(thisInB === b) // true