I looked around for how to use the Object.defineProperty method, but couldn’t find anything decent. Someone gave me this snippet of code: Object.defineProperty(player, “health”, { get: function () { return 10 + ( player.level * 15 ); } }) But I don’t understand it. Mainly, the get is what I can’t get (pun intended). How … Read more
When creating a JavaScript function with multiple arguments, I am always confronted with this choice: pass a list of arguments vs. pass an options object. For example I am writing a function to map a nodeList to an array: function map(nodeList, callback, thisObject, fromIndex, toIndex){ … } I could instead use this: function map(options){ … … Read more
I am using selenium for end to end testing and I can’t get how to use setup_class and teardown_class methods. I need to set up browser in setup_class method, then perform a bunch of tests defined as class methods and finally quit browser in teardown_class method. But logically it seems like a bad solution, because … Read more
I have an object that looks like this: var obj = { “objectiveDetailId”: 285, “objectiveId”: 29, “number”: 1, “text”: “x”, “subTopics”: [{ “subTopicId”: 1, “number”: 1 }, { “subTopicId”: 2, “number”: 32 }, { “subTopicId”: 3, “number”: 22 }] } var stToDelete = 2; I have lodash installed in my application for other things. Is … Read more
I just figured out that I can actually store objects in the $_SESSION and I find it quite cool because when I jump to another page I still have my object. Now before I start using this approach I would like to find out if it is really such a good idea or if there … Read more
I know how to parse a JSON String and turn it into a JavaScript Object. You can use JSON.parse() in modern browsers (and IE9+). That’s great, but how can I take that JavaScript Object and turn it into a particular JavaScript Object (i.e. with a certain prototype)? For example, suppose you have: function Foo() { … Read more
How can I transform a big object to array with lodash? var obj = { 22: {name:”John”, id:22, friends:[5,31,55], works:{books:[], films:[],} 12: {name:”Ivan”, id:12, friends:[2,44,12], works:{books:[], films:[],} } // transform to var arr = [{name:”John”, id:22…},{name:”Ivan”, id:12…}] 11 Answers 11
I know in JavaScript, objects double as hashes, but I have been unable to find a built-in function to get the keys: var h = {a:’b’, c:’d’}; I want something like var k = h.keys() ; // k = [‘a’, ‘c’]; It is simple to write a function myself to iterate over the items and … Read more
I was wondering if there was any way in JavaScript to loop through an object like so. for(var i in myObject) { // … } But get the name of each property like this. for(var i in myObject) { separateObj[myObject[i].name] = myObject[i]; } I can’t seem to find anything like it on Google. They say … Read more
Are there any forbidden characters in key names, for JavaScript objects or JSON strings? Or characters that need to be escaped? To be more specific, I’d like to use “$”, “-” and space in key names. 4 Answers 4