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| Given an array of ints, return the number of 9's in the array. array_count9([1, 2, 9]) → 1 array_count9([1, 9, 9]) → 2 array_count9([1, 9, 9, 3, 9]) → 3 ...Save, Compile, Run (ctrl-enter) | 
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Difficulty: 218.0
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