How JavaScript defines a new array using a constructor

This article mainly shows you "JavaScript how to use constructors to define new arrays", the content is easy to understand, well-organized, hope to help you solve your doubts, the following let Xiaobian lead you to study and learn "JavaScript how to use constructors to define new arrays" this article.

Define by using the constructor

When you use the new operator to call a function of type Array (), you can construct a new array.

Var array name = new Array (); / / empty array var array name = new Array (values list); / / real array

If you pass a numeric parameter to Array (), the parameter value is equal to the attribute value of the array length, and you can define the length of the array, that is, the number of elements contained.

Var a = new Array (5); / / an array of specified length

At this point, the default value of each element is undefined, which can be initialized by assigning a value to each element:

A [0] = 1 [1] = 2 [2] = 3; this is all of the article "how JavaScript defines a new array using constructors". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!