JavaScript 강제변환 톺아보기

Jul 29, 20200 likes165 views

JavaScript has implicit type conversions that occur between values in expressions and statements. It will convert data types to the expected type using various methods like ToString, ToNumber, and ToBoolean. For comparisons, it will convert types as needed such as converting a number to a string for comparison with a string using the appropriate ToPrimitive conversion.

ToBoolean
• Boolean Boolean
ToBoolean
• Falsy (undefined, null, false, +-0,
NaN, “”)
ToBoolean true

ToPrimitive
• ( )
ToPrimitive
• ToPrimitive ,
valueOf
toString

,
• Type(x) Number Type(y)
String , x == ToNumber(x)

null, undefined
• x null y undefined
x == y true

,
• Type(x) Type(y)
String Number ,
ToPrimitive(x) == y

Reference
• https://github.com/getify/You-Dont-Know-JS
• https://www.hanbit.co.kr/store/books/look.php?p_code=B8227329776

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