ES6 Array new features

1.array.from to create an instance of an array from an array of classes and traversed objects

　　Class array objects include: arguments in Functions, NodeList objects returned by document.getElementsByTagName (), newly added map and set data structures.

2.array.of method

　　The method behaves much like the constructor of the array, which is suitable for passing only one parameter, so array.of is a better choice for the new array (), so there are now three ways to build the array:

The Find,findindex,fill method of 3.Array

　　1) Find returns the first element that returns true for a callback

　　2) FindIndex returns the subscript of the first element that returns true for a callback function

3) Fill the element with the given parameter ' overwrite ' array

　　

Iv. Math

Several new methods have been added to the Math object:

　　

V. Extension operators

　　Extension operators are used to extend elements in specific places, such as extending an array of elements in an array.

ES6 Array new features