JavaScript 删除运算符不会影响JavaScript中Array的长度

Posted 2021-05-20

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