In ES2015 a.k.a ES6 version of JavaScript, a new datatype called Map is introduced. let map = new Map([[“key1”, “value1”], [“key2”, “value2”]]); map.get(“key1”); // => value1 check this reference for more info.
The prototype object is meant to be used on constructor functions, basically functions that will be called using the new operator to create new object instances. Functions in JavaScript are first-class objects, which means you can add members to them and treat them just like ordinary objects: var STORE = { item : function() { … Read more
You are missing some code there, but I assume its part of an object declaration like this: var obj = { queryString: function() { //some code } }; obj.queryString(); It assigns a function as a property of an object literal. It would be equivalent to this: var obj = {}; obj.queryString = function() { … … Read more
As BoltClock mentioned there is no object literal in PHP however you can do this by simply type casting the arrays to objects: $testArray = array( (object)array(“name” => “John”, “hobby” => “hiking”), (object)array(“name” => “Jane”, “hobby” => “dancing”) ); echo “Person 1 Name: “.$testArray[0]->name; echo “Person 2 Hobby: “.$testArray[1]->hobby;
That’s not JSON. It’s just Javascript objects, and has nothing at all to do with JSON. You can use brackets to set the properties dynamically. Example: var obj = {}; obj[‘name’] = value; obj[‘anotherName’] = anotherValue; This gives exactly the same as creating the object with an object literal like this: var obj = { … Read more
Yes, you can. Try this: interface IBaz { baz: number; [key: string]: any; } function foo(bar: IBaz) : number { return bar.baz; } foo({ baz: 1, other: 2 });
First off, your quoted code is not JSON. Your code is JavaScript object literal notation. JSON is a subset of that designed for easier parsing. Your code defines an object (data) containing an array (items) of objects (each with an id, name, and type). You don’t need or want jQuery for this, just JavaScript. Adding … Read more
If you want to use a variable for a property name, you can use Computed Property Names. Place the variable name between square brackets: var foo = “bar”; var ob = { [foo]: “something” }; // ob.bar === “something” If you want Internet Explorer support you will need to use the ES5 approach (which you … Read more
Why are template strings not allowed as literal object keys? Template strings are expressions, not literals1. You can only use string literals (and identifiers) for property names, for everything else – that is not known to be static – you need a computed property name. Is it for performance reasons? No, that’s unlikely. It’s to … Read more
Computed property names are supported in ECMAScript2015: var name=”key”; var value=”value”; var o = { [name]: value }; alert(“o as json : ” + JSON.stringify(o)); https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Object_initializer