@performance/constant-property-referencing-check-in-loops

在循环如需频繁访问某个常量，且该属性引用常量在循环中不会改变，建议提取到循环外部，减少属性访问的次数。

根据ArkTS高性能编程实践，建议修改。

规则配置

// code-linter.json5
{
  "rules": {
    "@performance/constant-property-referencing-check-in-loops": "suggestion",
  }
}

选项

该规则无需配置额外选项。

正例

class Time {
  static start: number = 0;
  static info: number[] = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12];
}
function getNum(num: number): number {
  /* Year has (12 * 29 =) 348 days at least */
  let total: number = 348;
  const info = Time.info[num- Time.start];  
  for (let index: number = 0x8000; index > 0x8; index >>= 1) {
    if ((info & index) != 0) {
      total++;
    }
  }
  return total;
}

反例

class Time {
  static start: number = 0;
  static info: number[] = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12];
}
function getNum(num: number): number {
  /* Year has (12 * 29 =) 348 days at least */
  let total: number = 348;
  for (let index: number = 0x8000; index > 0x8; index >>= 1) {
    // warning
    total += ((Time.info[num - Time.start] & index) !== 0) ? 1 : 0;
  }
  return total;
}

规则集

plugin:@performance/all

Code Linter代码检查规则的配置指导请参考Code Linter代码检查。