Created
July 30, 2012 17:06
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underscore.js mixin for plucking nested properties
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| _.mixin({ | |
| // Get/set the value of a nested property | |
| deep: function (obj, key, value) { | |
| var keys = key.replace(/\[(["']?)([^\1]+?)\1?\]/g, '.$2').replace(/^\./, '').split('.'), | |
| root, | |
| i = 0, | |
| n = keys.length; | |
| // Set deep value | |
| if (arguments.length > 2) { | |
| root = obj; | |
| n--; | |
| while (i < n) { | |
| key = keys[i++]; | |
| obj = obj[key] = _.isObject(obj[key]) ? obj[key] : {}; | |
| } | |
| obj[keys[i]] = value; | |
| value = root; | |
| // Get deep value | |
| } else { | |
| while ((obj = obj[keys[i++]]) != null && i < n) {}; | |
| value = i < n ? void 0 : obj; | |
| } | |
| return value; | |
| } | |
| }); | |
| // Usage: | |
| // | |
| // var obj = { | |
| // a: { | |
| // b: { | |
| // c: { | |
| // d: ['e', 'f', 'g'] | |
| // } | |
| // } | |
| // } | |
| // }; | |
| // | |
| // Get deep value | |
| // _.deep(obj, 'a.b.c.d[2]'); // 'g' | |
| // | |
| // Set deep value | |
| // _.deep(obj, 'a.b.c.d[2]', 'george'); | |
| // | |
| // _.deep(obj, 'a.b.c.d[2]'); // 'george' |
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| _.mixin({ | |
| pluckDeep: function (obj, key) { | |
| return _.map(obj, function (value) { return _.deep(value, key); }); | |
| } | |
| }); | |
| // Usage: | |
| // | |
| // var arr = [{ | |
| // deeply: { | |
| // nested: 'foo' | |
| // } | |
| // }, { | |
| // deeply: { | |
| // nested: 'bar' | |
| // } | |
| // }]; | |
| // | |
| // _.pluckDeep(arr, 'deeply.nested'); // ['foo', 'bar'] |
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| _.mixin({ | |
| // Return a copy of an object containing all but the blacklisted properties. | |
| unpick: function (obj) { | |
| obj || (obj = {}); | |
| return _.pick(obj, _.difference(_.keys(obj), _.flatten(Array.prototype.slice.call(arguments, 1)))); | |
| } | |
| }); |
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See also https://github.com/documentcloud/underscore-contrib/blob/master/underscore.object.selectors.js#L79