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JavaScript MCQs

Which of the following code is correct for validating date values?

var d = Date.parse('foo'); if (isNaN(d)==false) { alert(new Date(d)); } else { alert('Invalid date'); }

var d = new Date('foo'); if (d instanceof Date && isFinite(d)) { alert(d); } else { alert('Invalid date'); }

Date.prototype.valid = function() { return isFinite(this); } var d = new Date('foo'); if (d.valid()) { alert(d); } else { alert('Invalid date');

All of the above.

Answer

Correct Answer: var d = new Date('foo'); if (d instanceof Date && isFinite(d)) { alert(d); } else { alert('Invalid date'); }

Explanation:

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