get.js•1.28 kB
'use strict';
/**
* Simplified lodash.get to work around the annoying null quirk. See:
* https://github.com/lodash/lodash/issues/3659
* @api private
*/
module.exports = function get(obj, path, def) {
let parts;
let isPathArray = false;
if (typeof path === 'string') {
if (path.indexOf('.') === -1) {
const _v = getProperty(obj, path);
if (_v == null) {
return def;
}
return _v;
}
parts = path.split('.');
} else {
isPathArray = true;
parts = path;
if (parts.length === 1) {
const _v = getProperty(obj, parts[0]);
if (_v == null) {
return def;
}
return _v;
}
}
let rest = path;
let cur = obj;
for (const part of parts) {
if (cur == null) {
return def;
}
// `lib/cast.js` depends on being able to get dotted paths in updates,
// like `{ $set: { 'a.b': 42 } }`
if (!isPathArray && cur[rest] != null) {
return cur[rest];
}
cur = getProperty(cur, part);
if (!isPathArray) {
rest = rest.substr(part.length + 1);
}
}
return cur == null ? def : cur;
};
function getProperty(obj, prop) {
if (obj == null) {
return obj;
}
if (obj instanceof Map) {
return obj.get(prop);
}
return obj[prop];
}