What do parseInt and Number return for strings like "12px", "", and "1e3"?
console.log(parseInt("12px"));
console.log(Number("12px"));
console.log(parseInt(""));
console.log(Number(""));
console.log(Number(" 42\n"));
console.log(parseInt("1e3"));
console.log(Number("1e3"));
console.log(parseInt(0.0000005));
The answer
Work out every line it logs, in order. Then check.
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