ESLint表示数组从未修改，即使元素被推入数组 [英] ESLint says array never modified even though elements are pushed into array

问题描述

我正在转换一些现有的代码以遵循ECMA脚本，我正在使用ESLint遵循编码标准。我有以下ecmascript方法

I am converting some existing code to follow ECMA script and I am using ESLint to follow a coding standard. I have the following ecmascript method

static getArrayOfIndices(text, char) {
    let resultArray = [];
    let index = text.indexOf(char);
    const lastIndex = text.lastIndexOf(char);
    while (index <= lastIndex && index !== -1) {
      resultArray.push(index);
      if (index < lastIndex) {
        index = text.substr(index + 1).indexOf(char) + index + 1;
      } else {
        index = lastIndex + 1999; // some random addition to fail test condition on next iteration
      }
    }
    return resultArray;
  }

对于声明resultArray，ESLint会抛出错误

For the declaration of resultArray, ESLint throws the error

ESLint: `resultArray` is never modified, use `const`instead. (prefer-const)

但是由于元素被推入数组，是不是被修改？

But since elements are being pushed into the array, isn't it being modified?

推荐答案

要了解此错误，您必须了解 const 声明的变量保持对值的只读引用。但这并不意味着它的价值是不可变的 [mdn article] 。

To understand this error you must understand that const declared variables hold read-only references to a value. But it does not mean that the value it holds is immutable [mdn article].

由于您只是更改变量的成员，而是在绑定的 prefer-const 规则上执行重新分配的es-lint警告您，可以使用 const 声明的变量而不是 let 声明的变量。

Since you are only changing members of the variable but not performing a reassignment on the binding the prefer-const rule of es-lint warns you that a const declared variable could be used instead of a let declared variable.

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