How JavaScript uses the constructor property to determine whether a variable is an array

This article mainly introduces JavaScript how to use the constructor attribute to determine whether the variable is an array, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let Xiaobian take you to understand.

Use the constructor properties of the object

Each object has a constructor property (except for objects created using object.create (null), which is unlikely to happen). We can directly compare the constructor property to the constructor of JS. Therefore, if we compare it with the array constructor, we will know whether it is an array.

Note: a constructor is a function used to initialize an object. If you create an object using the new keyword, you use the constructor. For example, in let myArray = new Array (1Magol 2), the constructor used is Array ().

You can use the constructor property to determine whether the variable is an array:

Let result = {subject: "Science", marks: 97}; let numbers = [1,2,3,4,5]; let name = "Mark"; let names = new Array ("Xiao Zhi", "Xiao Li", "Xiao Wu"); console.log (result.constructor = Array); / / falseconsole.log (numbers.constructor = Array); / / trueconsole.log (name.constructor = Array); / / falseconsole.log (names.constructor = Array) / / true Thank you for reading this article carefully. I hope the article "how JavaScript uses the constructor attribute to determine whether a variable is an array" shared by the editor will be helpful to you. At the same time, I also hope you will support us and follow the industry information channel. More related knowledge is waiting for you to learn!