数组扩展代码在 TypeScript tslint 中导致错误 "The "this"keyword is disallowed outside a class body"

Question

我在 TypeScript 中编写了以下数组扩展方法代码。

interface Array<T> {
  divideInto(n: number): Array<T[]>
}

Array.prototype.divideInto = function<T> (n: number): T[][] {
  const items = this as T[];

  if (n < 1) {
    return []
  }

  const arrList = []
  let index = 0

  while (index < items.length) {
    arrList.push(items.slice(index, index+n))
    index += n
  }
  return arrList
}

当我构建此代码时，TSLint 显示以下错误消息。

the "this" keyword is disallowed outside of a class body

我不明白我的代码有什么问题。

有人可以给我建议吗？

Answer 1

让我们扩展数组 class:

class AugmentedArray<T> extends Array<T> {
  divideInto(n: number):T[][] {
    const items = this

    if (n < 1) {
      return []
    }

    const arrList = []
    let index = 0

    while (index < items.length) {
      arrList.push(items.slice(index, index+n))
      index += n
    }

    return arrList
  }
}

数组扩展代码在 TypeScript tslint 中导致错误 "The "this"keyword is disallowed outside a class body"

Array extension code results in error "The "this" keyword is disallowed outside of a class body" in TypeScript tslint

typescript

tslint