JavaScript对象的扁平化与反扁平化

function flatten(obj) {
var result = {};
function process(key, value) {
if (Object(value) !== value) {
if (key) {
result[key] = value;
}
} else if (Array.isArray(value)) {
for (var i = 0, len = value.length; i < len; i++) {
process(key + "[" + i + "]", value[i]);
}
if (value.length === 0 && key) {
result[key] = [];
}
} else {
var isEmpty = true;
for (var prop in value) {
isEmpty = false;
process((key ? key + "." : key) + prop, value[prop]);
}
if (isEmpty && key) {
result[key] = {};
}
}
}
process("", obj);
return result;
}

function unflatten(obj) {
if (Object(obj) !== obj || Array.isArray(obj)) {
return obj;
}
var result = {};
var r = /\.?([^\.\[\]]+)|\[(\d+)\]/g;
for (var prop in obj) {
var matchs;
var cur = result;
var p = "";
while(matchs = r.exec(prop)) {
cur = cur[p] || (cur[p] = matchs[2] ? []: {});
p = matchs[2] || matchs[1];
}
cur[p] = obj[prop];
}
return result[""] || result;
}