lodash

lodash lets me check for membership of basic data types with includes : _.includes([1, 2, 3], 2) > true But the following doesn't work: _.includes([{"a": 1}, {"b": 2}], {"b": 2}) > false This confuses me because the following methods that search through a collection seem to do just fine: _.where([{"a": 1}, {"b": 2}], {"b": 2}) > {"b": 2} _.find([{"a": 1}, {"b": 2}], {"b": 2}) > {"b": 2} What am I doing wrong? How do I check for the membership of an object in a collection with includes ? edit: question was originally for for lodash version 2.4.1, updated for lodash 4.0.0 p.s.w.g The includes

I'm playing around with React Native and lodash's debounce. Using the following code only make it work like a delay and not a debounce. <Input onChangeText={(text) => { _.debounce(()=> console.log("debouncing"), 2000)() } /> I want the console to log debounce only once if I enter an input like "foo". Right now it logs "debounce" 3 times. Debounce function should be defined somewhere outside of render method since it has to refer to the same instance of the function every time you call it as oppose to creating a new instance like it's happening now when you put it in the onChangeText handler

I have an object that looks like var foundUser = { charData: [] } which then I load an object from a database using mysql and then I call _.assignIn(foundUser, rows[0]); But I get a few extra properties that I don't need (this isn't solvable by using select) So I call foundUser = _.omit(foundUser, ['blah']); But it would be nice if I could just do _.assignIn(foundUser, rows[0]).omit(rows[0], ['blah']); But that throws an error, am I doing it wrong or is there another way this can be done? Kenneth To chain with lodash, you first have to wrap the object: _(foundUser).assignIn(rows[0]).omit([

Is there a built-in lodash function to take this: var params = [ { name: 'foo', input: 'bar' }, { name: 'baz', input: 'zle' } ]; And output this: var output = { foo: 'bar', baz: 'zle' }; Right now I'm just using Array.prototype.reduce() : function toHash(array, keyName, valueName) { return array.reduce(function(dictionary, next) { dictionary[next[keyName]] = next[valueName]; return dictionary; }, {}); } toHash(params, 'name', 'input'); Wondering if there's a lodash short-cut. another way with lodash 4.17.2 _.chain(params) .keyBy('name') .mapValues('input') .value(); or _.mapValues(_.keyBy

There's a nifty method to sort an array of objects based on several properties: var data = _.sortBy(array_of_objects, ['type', 'name']); However that is only for ascending sorting. Is there some handy way of defining direction per column? E.g. var data = _.sortBy(array_of_objects, [{'type': 'asc'}, {'name': 'desc'}]); As of lodash 3.5.0 you can use sortByOrder (renamed orderBy in v4.3.0): var data = _.sortByOrder(array_of_objects, ['type','name'], [true, false]); Since version 3.10.0 you can even use standard semantics for ordering (asc, desc): var data = _.sortByOrder(array_of_objects, ['type

How can I transform a big object to array with lodash? var obj = { 22: {name:"John", id:22, friends:[5,31,55], works:{books:[], films:[],} 12: {name:"Ivan", id:12, friends:[2,44,12], works:{books:[], films:[],} } // transform to var arr = [{name:"John", id:22...},{name:"Ivan", id:12...}] You can do var arr = _.values(obj); For documentation see here. _.toArray(obj); Outputs as: [ { "name": "Ivan", "id": 12, "friends": [ 2, 44, 12 ], "works": { "books": [], "films": [] } }, { "name": "John", "id": 22, "friends": [ 5, 31, 55 ], "works": { "books": [], "films": [] } } ]" A modern native solution

Hello guys I have two arrays var elements = [{ "id": "id_1", "type": "input", "businesstype": { "type": "text" } }, { "type": "label", "id": "id_234" }, { "id": "id_16677", "type": "div", }, { "id": "id_155", "type": "input", "businesstype": { "type": "password" } } ] var filterArray=[{type:'input',businesstype:{type:'text'}},{type:'div'}] and want common obejct like var output = [{ "id": "id_1", "type": "input", "businesstype": { "type": "text" } }, { "id": "id_16677", "type": "div", } ] How do I compare these two objects to get equal objects from elements. You could filter it with a