_xgroupBy.js•1.07 kB
var _curry2 = require('./_curry2');
var _has = require('./_has');
var _xfBase = require('./_xfBase');
var append = require('../append');
module.exports = (function() {
function XGroupBy(f, xf) {
this.xf = xf;
this.f = f;
this.inputs = {};
}
XGroupBy.prototype['@@transducer/init'] = _xfBase.init;
XGroupBy.prototype['@@transducer/result'] = function(result) {
var key;
for (key in this.inputs) {
if (_has(key, this.inputs)) {
result = this.xf['@@transducer/step'](result, this.inputs[key]);
if (result['@@transducer/reduced']) {
result = result['@@transducer/value'];
break;
}
}
}
this.inputs = null;
return this.xf['@@transducer/result'](result);
};
XGroupBy.prototype['@@transducer/step'] = function(result, input) {
var key = this.f(input);
this.inputs[key] = this.inputs[key] || [key, []];
this.inputs[key][1] = append(input, this.inputs[key][1]);
return result;
};
return _curry2(function _xgroupBy(f, xf) { return new XGroupBy(f, xf); });
}());