press-ui/common/utils/memoize.js

简单、易用的跨端组件库，兼容 Vue2 和 Vue3，同时支持 uni-app和普通 Vue 项目

/**
 * Simple memoize
 * wxs doesn't support fn.apply, so this memoize only support up to 2 args
 */

function isPrimitive(value) {
  const type = typeof value;
  return (
    type === 'boolean'
    || type === 'number'
    || type === 'string'
    || type === 'undefined'
    || value === null
  );
}

// mock simple fn.call in wxs
function call(fn, args) {
  if (args.length === 2) {
    return fn(args[0], args[1]);
  }

  if (args.length === 1) {
    return fn(args[0]);
  }

  return fn();
}

function serializer(args) {
  if (args.length === 1 && isPrimitive(args[0])) {
    return args[0];
  }
  const obj = {};
  for (let i = 0; i < args.length; i++) {
    obj[`key${i}`] = args[i];
  }
  return JSON.stringify(obj);
}

export function memoize(fn) {
  const cache = {};

  return function () {
    const key = serializer(arguments);
    if (cache[key] === undefined) {
      cache[key] = call(fn, arguments);
    }

    return cache[key];
  };
}

export default memoize;