¿Qué sucede con una matriz asociativa en JavaScript?

What happens to an associative array in JavaScript?

When you assign values ​​to keys in a variable of type Array, the array is transformed into an object, and it loses the attributes and methods of Array. The length attribute has no effect because the variable is not longer of Array type.

JavaScript Array slice () Method 1 Definition and Usage. The slice () method returns the selected elements in an array, as a new array object. 2 Browser Support. The numbers in the table specify the first browser version that fully supports the method. 3 Syntax 4 Parameter Values. 5 Technical Details 6 More Examples 7 Related Pages

From there, to get the number of keys is simple: The keys method returns an array of all the attributes, so keys, and we can apply the length attribute of Array. We can transform an associative array, ie an object, into a simple array.

But the easiest way to go through an associative array in a particular order is to keep a separate ordering array. Like so: There is a super simple way to do this that I came up with tonight.It will search for a key, splice it like normal and return the removed element like the normal function.

JavaScript directly allows array as dynamic only. We can perform adding, removing elements based on index values. We no need to write extra logic to perform these operations. While an element removed from an array then array size must be decreased and if an element added to an array then array size becomes increased.

The length attribute has no effect because the variable is not longer of Array type. We will demonstrate all that and also show how to add a key method to an object to have the number of items it holds when it becomes an associative array.