Add (Set) context.log in side loop in JavaScript

Please let me know how can I add above context log with correct syntax.

context.log("START - for loop to push data to array");
for(let i = 0; i < floors.items.length; i++) {
	let item = floors.items[i].data;

	let itemFloornumber = item.floorNumber + 1;

	let floorNumber = "";
	//Positive number between 0 and 9
	if(itemFloornumber < 10 && itemFloornumber >= 0) {
		floorNumber = "0" + itemFloornumber;

	//Negative number between -1 to -9
	} else if(itemFloornumber < 0 && itemFloornumber > -10) {
		floorNumber = "0" + itemFloornumber * -1;

	//Negative number less than -9
	} else if(itemFloornumber <= -10) {
		floorNumber = "" + itemFloornumber * -1;

	//Positive number bigger than 9
	} else {
		floorNumber = itemFloornumber;
	}

	if(typeof(types[item.floorType]) != 'undefined') {
		floorNumber += types[item.floorType];
	}

	if(itemFloornumber <= 0) {
		floorNumber += types['Negative'];
	}
	
	//SQL, not hard code

	let bygningsnummer = buildings.filter(building => building.daluxid == item.buildingID)[0].ISYEnummer;

	procedureData.floors.push({
		DaluxEtasjeID: item.id,
		DaluxBuildingID: item.buildingID,
		Etasjenummer: floorNumber,
		Bygningsnummer: bygningsnummer,
		Bygningsnavn: item.buildingName,
		Etasjenavn: item.name,
		BTA: item.grossarea,
		NTA: item.netarea,
		hoyde: item.height,
		DaluxSistEndret: item.lastChange
	});
}
context.log("END - for loop to push data to array");

I want to add some context log traces into the for loop before line

let item = floors.items[i].data;

The context log traces should look something like this, syntax might be wrong

if (floors.items[i] == null))
	context.log(‘floors.items[i] == null. i = ${i}’)
else if (floors.items[i].data == null)
	context.log(‘floors.items[i].data == null. i = ${i}’)
else
	context.log(item)