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JavaScript Arrays

Objects are just arrays of properties. However, properties are accessed somewhat differently than array elements. New properties added to an object at any time. It is possible because properties usually only use the left side of the array.

The array creation functions organized into two categories: those that place the enhanced properties at the end, and those that set the enhanced properties at the beginning. The first four array creation methods set the enhanced properties at the end of the array and initialize all empty slots to "@." They differ in how they handle the enhanced properties.

The final three creation methods place the enhanced properties at the beginning of the array. This set of methods can be used to examine the consequences of not initializing the array, or initializing all of the elements to the same thing, and of initializing only the empty elements.

One of the biggest criticisms of associative arrays is that they are one-dimensional. The argument made that the left and right sides constitute a second dimension, of size two, but this is not a true multi-dimensional array.
In fact, two-dimensional arrays are just arrays of arrays. Because of the nature of associative arrays, one can develop such complex structures with relative ease.

Properties are just array elements, so the question is where in the item list they should be placed. If we put them at the beginning, the array elements proper do not start at index=1. If we bring them at the end, the array elements are in the right place, but it is now harder to increase the size of the array.
It is because there are referencing problems if you access the properties by their array index, rather than by their names.

JavaScript strings provide an excellent example of the polymorphism. Strings in JavaScript can think of as HTML objects, in addition to their usual meaning.
It is because JavaScript provides methods for giving strings many of the formatting characteristics of HTML text, such as bold (<B>), italics (<I>), big (<BIG>), link (<A>), and so on.
Double replacement scheme

A special procedure, known as a double replacement scheme, must be used to clear or reset an existing array.
This particular approach is needed because you have no way of knowing what values already stored in the array. In particular, you have no way of knowing that they are unique.


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