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文字列ほか→数値変換と判定一覧

2022-09-29 2022-10-11 07:27:32 開発 JavaScript

たまに忘れるので…

value	type	Number(+)	Number(\|0)	isNaN	Number.isNaN	isFinite	Number.isFinite
""	string	0	0	false	false	true	false
" "	string	0	0	false	false	true	false
"abc"	string	NaN	0	true	false	false	false
"234"	string	234	234	false	false	true	false
5	number	5	5	false	false	true	true
12.3	number	12.3	12	false	false	true	true
Infinity	number	Infinity	0	false	false	false	false
-Infinity	number	-Infinity	0	false	false	false	false
NaN	number	NaN	0	true	true	false	false
true	boolean	1	1	false	false	true	false
false	boolean	0	0	false	false	true	false
undefined	undefined	NaN	0	true	false	false	false
null	object	0	0	false	false	true	false
[]	object(Array)	0	0	false	false	true	false
[654]	object(Array)	654	654	false	false	true	false
["abc"]	object(Array)	NaN	0	true	false	false	false
[654,897]	object(Array)	NaN	0	true	false	false	false
["abc","def"]	object(Array)	NaN	0	true	false	false	false
{}	object(Object)	NaN	0	true	false	false	false
{"a":654}	object(Object)	NaN	0	true	false	false	false
{"b":"abc"}	object(Object)	NaN	0	true	false	false	false