_stepCat.js•1.21 kB
var _assign = require('./_assign');
var _identity = require('./_identity');
var _isTransformer = require('./_isTransformer');
var isArrayLike = require('../isArrayLike');
var objOf = require('../objOf');
module.exports = (function() {
var _stepCatArray = {
'@@transducer/init': Array,
'@@transducer/step': function(xs, x) {
xs.push(x);
return xs;
},
'@@transducer/result': _identity
};
var _stepCatString = {
'@@transducer/init': String,
'@@transducer/step': function(a, b) { return a + b; },
'@@transducer/result': _identity
};
var _stepCatObject = {
'@@transducer/init': Object,
'@@transducer/step': function(result, input) {
return _assign(
result,
isArrayLike(input) ? objOf(input[0], input[1]) : input
);
},
'@@transducer/result': _identity
};
return function _stepCat(obj) {
if (_isTransformer(obj)) {
return obj;
}
if (isArrayLike(obj)) {
return _stepCatArray;
}
if (typeof obj === 'string') {
return _stepCatString;
}
if (typeof obj === 'object') {
return _stepCatObject;
}
throw new Error('Cannot create transformer for ' + obj);
};
}());