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/**
* 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;