10 lines
242 B
JavaScript
10 lines
242 B
JavaScript
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function mean(array) {
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return !array.length ? 0
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: array.reduce(function(pre, cur, i) {
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return (pre * i + cur) / (i + 1);
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});
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}
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alert( mean( [1,2,3,4,5] ) ); // 3
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alert( mean( [] ) ); // 0
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