Why does the array still have a non-zero length after deletion?

Question

I have the following code that outputs the length of an array, deletes it, and then outputs the new length:

console.log($scope.adviceList.activeAdvices.lengt         


        

Answer 1

if you want "delete" a item in array,you could

var a = ["a","b"];
console.log(a);  //a,b
console.log(a.length);//2
a.length = 1;//"delete" all greater than length 1 of items;
console.log(a);//a
console.log(a.length);//1

or

 var a = ["a","b"];
    console.log(a);  //a,b
    console.log(a.length);//2
    a.pop();//"delete" the last in array:"b"
    console.log(a);//a
    console.log(a.length);//1

or

 var a = ["a","b"];
    console.log(a);  //a,b
    console.log(a.length);//2
    a.shift();//"delete" the first in array:"a"
    console.log(a);//b
    console.log(a.length);//1

or

 var a = ["a","b"];
    console.log(a);  //a,b
    console.log(a.length);//2
    a.splice(1,1);//"delete" from index 1(include,first parameter),delete number is 1(second parameter)
    console.log(a);//a
    console.log(a.length);//1