在JavaScript中实现备忘录功能

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想要改进此问题？添加详细信息并通过

闭合 2年前。

Answer 1

可能您正在寻找这样的东西：

function memoizeTransform(f) {
  let valOne;
  let valTwo;
  let lastResult;
  return (x1, x2) => {
    if (valOne === x1 && valTwo === x2) {
      console.log("Cached...");
      return lastResult;
    } else {
      lastResult = f(x1, x2);
      valOne = x1;
      valTwo = x2;
      return lastResult;
    }
  };
}

function sum(a, b) {
  console.log('Calculating...');
  return a + b;
}

let f = memoizeTransform(sum);
console.log(f(1, 2));
console.log(f(1, 2));
console.log(f(2, 3));