删除操作员密码™不影响JavaScript中数组的长度

Posted 2021-02-23

delete Operator don’t impact the length of Array in javascript

Ref: https://techfiddler.wordpress.com/2015/06/02/delete-operator-dont-impact-the-length-of-array-in-javascript/
 
 
 
var fruits = ["Apple" , "Banana", "Grape", "Litchi", "Mango", "Orange"];
 
console.log(fruits.length); //prints 6 as there are six elements
console.log(fruits[3]); //prints Litchi
delete fruits[3];
console.log(fruits.length); //still prints 6
console.log(fruits[3]); //prints undefined