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22 lines
527 B
JavaScript
22 lines
527 B
JavaScript
function subtraction(arr)
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{
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if (Object.prototype.toString.call(arr) === '[object Array]') {
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var total = arr[0];
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if (typeof (total) !== 'number') {
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return false;
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}
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for (var i = 1, length = arr.length; i < length; i++)
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{
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if (typeof (arr[i]) === 'number')
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{
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total -= arr[i];
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}
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else
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return false;
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}
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return total;
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}
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else
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return false;
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}
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console.log(subtraction([7,3, 2,-1]));
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