JavaScript手写源码之omit函数的实现

pnpm add -D vitest

 "scripts": {
    "test": "vitest"
  }

import { describe, expect, test } from "vitest"
import { myOmit } from "."

describe("omit", () => {
  test("should create a shallow copy", () => {
    const mick = { name: "mick" }
    const copy = myOmit(mick, [])
    expect(copy).toEqual({ name: "mick" })
  })

  test("should drop fields which are passed in ", () => {
    const mick = { name: "mick", age: 18 }

    const copy = myOmit(mick, ["age"])

    expect(copy).toEqual({ name: "mick" })
    expect(mick).toEqual({ name: "mick", age: 18 })
    expect(myOmit(mick, ["name", "age"])).toEqual({})
  })
})

export function myOmit(value, args) {
  const shallowCopy = Object.assign({}, value)

  for (let i = 0; i < args.length; i++) {
    const key = args[i]
    if (key in shallowCopy) {
      delete shallowCopy[key]
    }
  }

  return shallowCopy
}