Why is the value "" <{} true?

Question

In JavaScript, why:

"" < {}rate trueand

"" < []rate it false?

Answer 1

Because it <forces its arguments. He prefers to compare numbers, but if the objects do not support a numerical primitive value, he executes the lines, and you end up doing lexical comparison. String({})- "[object Object]"but String([])- "". "" < "[object Object]" truebut "" < ""- false.

All gora details in the specification (fair warning, language mildly expressed).

---

:

, , Number({}) NaN, Number([]) - 0. NaN < 0 false, 0 < NaN. ?

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• < abtract ToPrimitive .
• , [[DefaultValue]] "" "".
• [[DefaultValue]] (hint = Number) valueOf , , ; , [[DefaultValue]] toString. valueOf ( ) , [[DefaultValue]] toString.
• < , .

, ToPrimitive , < ; Number (, JavaScript , , ), Number#valueOf [[DefaultValue]], Number#valueOf . < .

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