Deleting .json Items || = undefined??

[Chazrox]

How do we delete an item from .json? My 'Rename Preset' isnt replacing the selected preset for some reason, its adding a new item. Im removing the item before writing the object back to file so im assuming the deleting isnt happening.

		//-------Delete the Old Entry---------------------------		
		AttackTablePresets[oldName] = undefined;

This is the full 'Rename' button script as of now...

// -------------------------RENAME PRESET BUTTON CONTROLS-----------------------		
	inline function onRenamePresetButtonControl(component, value)
	{
		if (!value)
			return;
		//-------------------------------------------------------------------			
		local oldName = PresetList.getItemText(); // Name in combobox
		local newName = PresetNameToSave.get("text").trim(); // Name in text field

		//-------------------------------------------------------------------
		if (newName == "" || newName == oldName)
			return;

		//-------------------------------------------------------------------		
		// If new name already exists, do nothing or show warning. 
		if (isDefined(AttackTablePresets[newName]))
		{
			Console.print("A preset with that name already exists.");
			return;
		}

		//-------------------------------------------------------------------	
		// Duplicate Data
		AttackTablePresets[newName] = AttackTablePresets[oldName]; // Copy data FROM oldName TO newName

		//-------------------------------------------------------------------		
		// Rebuild the object without the old key
		local newPresets = {}; // Clear the array
		for (k in AttackTablePresets)
		{
			if (k != oldName)
				newPresets[k] = AttackTablePresets[k]; // Array, newPresets now without oldName
		}

		//-------------------------------------------------------------------
		AttackTablePresets = newPresets.clone(); // Hand back to main array AttackTablePresets		

		//-------------------------------------------------------------------	
		// Get current values	
		local tableData0 = TableEnvelope1Pro.exportAsBase64(0); // ATTACK TABLE
		local attackKnob = knbAttack.getValue(); // ATTACK TIME KNOB

		AttackTablePresets[newName] = [
			TableEnvelope1Pro.exportAsBase64(0),
			knbAttack.getValue()
		];				

		//-------Delete the Old Entry---------------------------		
		AttackTablePresets[oldName] = undefined;	
		//-------------------------------------------------------------------		
		// Write object to file
		presetFile1.writeObject(AttackTablePresets);
		//-------------------------------------------------------			
		// Update ComboBox
		local keyList = [];

		for (k in AttackTablePresets)
			keyList.push(k);		
		//-------------------------------------------------------------------
		// Repopulate combobox items and set new value
		PresetList.set("items", keyList.join("\n"));
		PresetList.setValue(keyList.indexOf(newName) +1);
		//-------------------------------------------------------------------		
		PresetNameToSave.set("text", "");
	};
	RenamePresetButton.setControlCallback(onRenamePresetButtonControl);

.json in xcode after trying to rename "1" to "11"

then my preset combobox has some rogue values. The .json doesnt show those values so idk.

[d.healey]

The usual way is to set it to undefined, however very recently the topic came up and Christoph mentioned adding a proper remove function. I'm not sure if it was implemented though.

https://forum.hise.audio/topic/12930/how-can-i-efficiently-remove-a-key-from-an-object/7?_=1752576494711

[Chazrox]

@d-healey darn, so even if he did it would require me to update which Im afraid to do. Any other suggestions?

[d.healey]

@Chazrox said in Deleting .json Items || = undefined??:

Any other suggestions?

In that same thread there's an example function for removing an item from an object by rebuilding the object.

[Chazrox]

@d-healey If its writing the new data, and not deleting the old one...where are these numbers coming from?

they look like items i've added and removed before but if they arent showing up in the .json file, where are they?