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onlyNumbers

onlyNumbers

					var x = [1,2,3,'',false,4,'cool', null, function a(){}];
					var y = onlyNumbers(x);
					// → y = [1, 2, 3, 4];

					console.log(onlyNumbers([1,2,3,'',false,4,'cool', null, function a(){}]));
					// → [1, 2, 3, 4];
				
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