Docs: Define functions used in loop examples (#4653)
* Cherrypick changes from messy branch * Reorder function defs
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# Eat lunch.
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eat = (food) -> "#{food} eaten."
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eat food for food in ['toast', 'cheese', 'wine']
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# Fine five course dining.
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courses = ['greens', 'caviar', 'truffles', 'roast', 'cake']
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menu = (i, dish) -> "Menu Item #{i}: #{dish}"
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menu i + 1, dish for dish, i in courses
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# Health conscious meal.
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