从Java关联数组中删除项目

Question

I have an associative array in my JS which I want to feed my Select.

These are the standard hours available that will refresh my availablehours (when page loads);

var standardhours = {
  "09" : '9AM',
  "10" : '10AM',
  "11" : '11AM',
  "12" : 'Noon',
  "13" : '1PM',
  "14" : '2PM',
  "15" : '3PM',
  "16" : '4PM',
  "17" : '5PM',
  "18" : '6PM',
  "19" : '7PM'
};

These the available hours that I want to feed my Select.

var availablehours = {
    "09" : '9AM',
    "10" : '10AM',
    "11" : '11AM',
    "12" : 'Noon',
    "13" : '1PM',
    "14" : '2PM',
    "15" : '3PM',
    "16" : '4PM',
    "17" : '5PM',
    "18" : '6PM',
    "19" : '7PM'
};

This is my dynamic variable that changes based on database changes. These are the hours taken by someone already.

takenHours = {"09", "18"};

I want to remove the takenHours from the availablehours associative array. Not sure how. The thought process I have feels very manual and simplistic.

Answer 1

If I understand correctly, then you should be able to achieve this kind of mutation of availablehours via the delete operator, as shown:

 var availablehours = { "09": '9AM', "10": '10AM', "11": '11AM', "12": 'Noon', "13": '1PM', "14": '2PM', "15": '3PM', "16": '4PM', "17": '5PM', "18": '6PM', "19": '7PM' }; console.log(availablehours); var takenHours = ["09", "18"]; // Iterate through the hours to be removed for (var takenHour of takenHours) { // For each hour key, use the delete operator to remove // the key/value pair from availablehours completlty delete availablehours[takenHour] } // availablehours will no longer contain "09" or "18" key/value pairs console.log(availablehours);