Pre-workout snack?

Probably not really necessary if you're getting adequate nutrition and calories throughout the day...that said, I don't really know the context of your question.

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I've been swimming at lunchtime lately and I eat an apple before I go. I come back and eat the rest of my lunch.

I'd say it depends on what type of workout you're doing. Fasted cardio (max 45 mins) is a great start to the day of you're looking to torch fat but I wouldn't imagine it's realistic to expect to do a heavy weights session on an empty stomach. A lot depends on whether you need to eat to get your motor started each day.

I chug a bullet coffee before a morning cardio session which gets me pumped then eat a high carb breakfast with some good protein and fats afterwards and REALLY enjoy my meal

On Mon, Wed, and Thu, I usually lift after work. Since it's been a few hours since lunch, I usually eat a protein bar before.

On Sun, I lift before breakfast. Sometimes, I eat a protein bar before. Sometimes, I don't - depends on how I feel.

I probably don't really need it, but it helps keep me from getting hunger pangs and/or cranky while lifting.

Nope. I workout straight out of bed. About 3 hours later I have my coffee, then I might have a snack 2 hours after that. My main food doesn't normally happen until shortly after noon, small lunch, after noon snack, then I eat more in the evening.

Depends on your goal and the type of exercise.
Most aerobic exercise (ie below lactate threshold) can be done fasting. Doing some of your exercise fasting can help with fat loss.
If your pre-workout snack is primarily carbohydrate your body will preferentially use carbohydrate to fuel that activity. This can make it harder to lose fat.
If you are doing over threshold exercise (such as sprinting, VO2 max work, etc) your performance may suffer if you are fasting or carb depleted. But being carb depleted is a great way to make your body metabolize fat.

So if you are at or near your desired body composition and you are primarily concerned with improving performance, fuel up pre (and likely post) workout, especially for any work over threshold, or work > 60-90 min.
If your main goal is to lose fat, try fasting workouts, fasting recovery, and/or non-carb fueling.

Why not just try it for yourself? If it helps, keep doing it. If it doesn't, then don't.

I can add that it depends on your goals and your workout. I have read studies showing that fasting exercise in the morning promotes weight loss. This has limits. Once the glycogen is gone, the workout is over! So, if you're​ planning an all-day bike ride, I suggest eating before (and during)!

Always before a morning workout. Something light like cottage cheese with strawberries or a protein fruit smoothie. I've tried going without but I get weak and lightheaded, so it's a must for me.

oatmeal, its has the carbs you need to help supply the body energy to exercise.

I workout/run in the mornings. I'm not a breakfast eater because I snack in the evening. I almost never wake up hungry. I'll drink black coffee, but that's it.

I'm training for a half marathon so I'm trying to figure out fueling. My long runs are now 9 miles. 10 miles next week. It's tricky. I'm not sure I need fuel, but I don't want to crash towards the end either. I'm not fast so, a 10 mile run means I'm running for an hour and half.