13 lines
552 B
CoffeeScript
13 lines
552 B
CoffeeScript
isEmptyString = (s) ->
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# Returns true iff s is an empty string.
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# (This returns false for non-strings as well.)
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return true if s instanceof String and s.length == 0
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s == ''
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empties = ["", '', new String()]
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non_empties = [new String('yo'), 'foo', {}]
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console.log (isEmptyString(v) for v in empties) # [true, true, true]
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console.log (isEmptyString(v) for v in non_empties) # [false, false, false]
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console.log (s = '') == "" # true
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console.log new String() == '' # false, due to underlying JavaScript's distinction between objects and primitives
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