let new_json = {
sessions: []
};
new_json.sessions[0]["timing"] = []
Error:
VM73:1 Uncaught TypeError: Cannot set property 'timing' of undefined
at <anonymous>:1:32
(anonymous) @ VM73:1
Here I am trying to add data to one index of the array
But, getting above error while doing this.
Is there any way to do this?
Please have a look
First initialize the object at 0th position and the add the value like this
new_json.sessions[0] = {};
new_json.sessions[0]["timing"] = []
You can do this by pushing the new object with timing property into the sessions array,
let new_json = { sessions: [] };
new_json.sessions.push({ timing: [] })
console.log(new_json.sessions)This would work:
new_json.sessions[0] = { timing: []}
In JavaScript you can, if you want, set the value of an arbitrary index in an array. But you cannot assign the property of an unassigned value at an arbitrary index, as your code attempts to do. That is accessing the value at the index, not setting the value.
0. Sonew_json.sessions[0]will giveundefined. This results in an error when you try and set a property of"timing"onundefined. Instead, you can set the value of index0to be an object literal, with the property of timing and an array value. Or, initialize your sessions array with an empty object[{}]