JavaScript / Prototype.js：从JSON对象中删除属性

Question

var myJsonObj = {"employees":[{"name":"John", "lastName":"Doe", "age": 55},{"name":"Jane", "lastName":"Doe", "age":69}]};

How can I delete myJsonObj.eployees[1] ?

Thank you :)

Answer 1

delete myJsonObj.employees[1];

However, this will keep the index of all the other elements. If you want to re-order the index, too, you could use this:

// store current employee #0
var tmp = myJsonObj.employees.shift();
// remove old employee #1
myJsonObj.employees.shift();
// re-add employee #0 to the start of the array
myJsonObj.employees.unshift(tmp);

Or you use simply Darin Dimitrov's splice solution (see his answer below).

Answer 2

myJsonObj.employees.splice(1, 1);

Answer 3

Use delete :

delete myJsonObj.employees[1] 

or set it to null

myJsonObj.employees[1] = null;

Neither will affect the indices of any elements following the element deleted from an array.