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'use strict';
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.default = memoize;
var _identity = require('lodash/identity');
var _identity2 = _interopRequireDefault(_identity);
var _rest = require('lodash/rest');
var _rest2 = _interopRequireDefault(_rest);
var _has = require('lodash/has');
var _has2 = _interopRequireDefault(_has);
var _setImmediate = require('./internal/setImmediate');
var _setImmediate2 = _interopRequireDefault(_setImmediate);
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
function memoize(fn, hasher) {
var memo = Object.create(null);
var queues = Object.create(null);
hasher = hasher || _identity2.default;
var memoized = (0, _rest2.default)(function memoized(args) {
var callback = args.pop();
var key = hasher.apply(null, args);
if ((0, _has2.default)(memo, key)) {
(0, _setImmediate2.default)(function () {
callback.apply(null, memo[key]);
});
} else if ((0, _has2.default)(queues, key)) {
queues[key].push(callback);
} else {
queues[key] = [callback];
fn.apply(null, args.concat([(0, _rest2.default)(function (args) {
memo[key] = args;
var q = queues[key];
delete queues[key];
for (var i = 0, l = q.length; i < l; i++) {
q[i].apply(null, args);
}
})]));
}
});
memoized.memo = memo;
memoized.unmemoized = fn;
return memoized;
}
module.exports = exports['default'];
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