55 lines
1.0 KiB
XML
55 lines
1.0 KiB
XML
/**
|
|
* Simple memoize
|
|
* wxs doesn't support fn.apply, so this memoize only support up to 2 args
|
|
*/
|
|
|
|
function isPrimitive(value) {
|
|
var 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];
|
|
}
|
|
var obj = {};
|
|
for (var i = 0; i < args.length; i++) {
|
|
obj['key' + i] = args[i];
|
|
}
|
|
return JSON.stringify(obj);
|
|
}
|
|
|
|
function memoize(fn) {
|
|
var cache = {};
|
|
|
|
return function() {
|
|
var key = serializer(arguments);
|
|
if (cache[key] === undefined) {
|
|
cache[key] = call(fn, arguments);
|
|
}
|
|
|
|
return cache[key];
|
|
};
|
|
}
|
|
|
|
module.exports.memoize = memoize;
|