destructuring assignment

【destructuring assignment】

　　The destructuring assignment syntax is a JavaScript expression that makes it possible to extract data from arrays or objects into distinct variables.

　　

　　A variable can be assigned a default, in the case that the value pulled from the array is undefined.

　　

　　You can ignore return values that you're not interested in:

　　

　　When destructuring an array, you can assign the remaining part of it to a variable using the rest pattern:

　　

　　

　　Object destructuring

　　

　　A variable can be assigned its value with destructuring separate from its declaration.

　　

　　Assigning to new variable names

　　

　　default values

　　

　　Nested object and array destructuring

　　

　　For of iteration and destructuring

　　

参考：https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment