How do I create a dynamic key to be added to a JavaScript object variable duplicate. In JavaScript, all arrays are objects, but not all objects are arrays.

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• An Object has a prototype, so there are default keys in the map. (This can be bypassed using map = Object.create(null).) These three tips can help you to decide whether to use a Map or an Object: Use maps over objects when keys are unknown until run time, and when all keys are the same type and all values are the same type.
• Sep 14, 2017  In this article we would be discussing Map object provided by ES6.Map is a collection of elements where each element is stored as a Key, value pair. Map object can hold both objects and primitive values as either key or value. When we iterate over the map object it returns the key,value pair in the same order as inserted.
• Apr 10, 2020 New Users: Before you can start using the Google Maps Platform APIs and SDKs, you must sign up and create a billing account. To learn more, see Get Started with Google Maps Platform. To use the Maps JavaScript API you must have an API key.
• An Object has a prototype, so there are default keys in the map. (This can be bypassed using map = Object.create(null).) These three tips can help you to decide whether to use a Map or an Object: Use maps over objects when keys are unknown until run time, and when all keys are the same type and all values are the same type.
• That’s the same, because Object.fromEntries expects an iterable object as the argument. Not necessarily an array. And the standard iteration for map returns same key/value pairs as map.entries.So we get a plain object with same key/values as the map. A Set is a special type collection – “set of values” (without keys), where each value may occur only once.
• If we ever create a data structure of our own, we should implement them too. They are supported for: Map; Set; Array; Plain objects also support similar methods, but the syntax is a bit different. Object.keys, values, entries. For plain objects, the following methods are available: Object.keys(obj) – returns an array of keys.

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An object is an instance which contains set of key value pairs. The values can be scalar values or functions or even array of other objects. The syntax is given below −

Syntax

As shown above, an object can contain scalar values, functions and structures like arrays and tuples.

Example: Object Literal Notation

On compiling, it will generate the same code in JavaScript.

The output of the above code is as follows −

TypeScript Type Template

Let’s say you created an object literal in JavaScript as −

In case you want to add some value to an object, JavaScript allows you to make the necessary modification. Suppose we need to add a function to the person object later this is the way you can do this.

If you use the same code in Typescript the compiler gives an error. This is because in Typescript, concrete objects should have a type template. Objects in Typescript must be an instance of a particular type.

You can solve this by using a method template in declaration.

Generate Key Map Object Javascript Download

Example: Typescript Type template

On compiling, it will generate the same code in JavaScript.

The output of the above code is as follows −

Objects can also be passed as parameters to function.

Example: Objects as function parameters

The example declares an object literal. The function expression is invoked passing person object.

Debian openssl key generation for putty. On compiling, it will generate following JavaScript code.

Its output is as follows −

You can create and pass an anonymous object on the fly.

Example: Anonymous Object

On compiling, it will generate following JavaScript code.

Its output is as follows −

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Duck-typing

In duck-typing, two objects are considered to be of the same type if both share the same set of properties. Duck-typing verifies the presence of certain properties in the objects, rather than their actual type, to check their suitability. The concept is generally explained by the following phrase −

“When I see a bird that walks like a duck and swims like a duck and quacks like a duck, I call that bird a duck.”

The TypeScript compiler implements the duck-typing system that allows object creation on the fly while keeping type safety. The following example shows how we can pass objects that don’t explicitly implement an interface but contain all of the required members to a function.

Example