JavaScript Operatorlar Ustivorligi (Operator Precedence)

Amallar tartibi

Operatorlar ustivorligi arifmetik ifodada amallar bajariladigan tartibni tavsiflaydi. Ko'paytirish (*) va bo'lish (/) qo'shish (+) va ayirish (-) dan yuqoriroq ustunlikka ega.

An'anaviy matematikadagidek, ko'paytirish birinchi bajariladi:

let x = 100 + 50 * 3

Qavslardan foydalanganda, qavslar ichidagi amallar birinchi hisoblanadi:

let x = (100 + 50) * 3

Bir xil ustunlikka ega amallar (masalan * va /) chapdan o'ngga hisoblanadi:

let x = (100 / 50) * 3

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Operator ustunlik qiymatlari

Qavslar ichidagi ifodalar qolgan ifodadan oldin hisoblanadi. Funksiyalar natija ifodaning qolgan qismida ishlatilishidan oldin bajariladi.

Qiymat	Operator	Tavsif	Misol
18	( )	Ifodani guruhlash	(100 + 50) * 3
17	.	A'zo	person.name
17	[]	A'zo	person["name"]
17	?.	Ixtiyoriy zanjir (ES2020)	x ?. y
17	()	Funksiya chaqiruv	myFunction()
17	new	Argumentli new	new Date("June 5,2022")
16	new	Argumentsiz new	new Date()

Oshirish operatorlari

Postfiks oshirishlar prefiks oshirishlardan oldin bajariladi

Qiymat	Operator	Tavsif	Misol
15	++	Postfiks oshirish	i++
15	--	Postfiks kamaytirish	i--
14	++	Prefiks oshirish	++i
14	--	Prefiks kamaytirish	--i

NOT operatorlari

Qiymat	Operator	Tavsif	Misol
14	!	Mantiqiy NOT	!(x==y)
14	~	Bitli NOT	~x

Unar operatorlar

Qiymat	Operator	Tavsif	Misol
14	+	Unar plyus	+x
14	-	Unar minus	-x
14	typeof	Ma'lumot turi	typeof x
14	void	Void baholash	void(0)
14	delete	Xususiyat o'chirish	delete myCar.color

Arifmetik operatorlar

Darajaga ko'tarishlar ko'paytirishlardan oldin bajariladi. Ko'paytirish va bo'lishlar qo'shish va ayirishlardan oldin bajariladi.

Qiymat	Operator	Tavsif	Misol
13	**	Darajaga ko'tarish (ES2016)	10 ** 2
12	*	Ko'paytirish	10 * 5
12	/	Bo'lish	10 / 5
12	%	Bo'lish qoldig'i	10 % 5
11	+	Qo'shish	10 + 5
11	-	Ayirish	10 - 5
11	+	Birlashtirish	"John" + "Doe"

Surish operatorlari

Qiymat	Operator	Tavsif	Misol
10	<<	Chapga surish	x << 2
10	>>	O'ngga surish (ishorali)	x >> 2
10	>>>	O'ngga surish (ishorasiz)	x >>> 2

Munosabat operatorlari

Qiymat	Operator	Tavsif	Misol
9	in	Obyektdagi xususiyat	"PI" in Math
9	instanceof	Obyekt instansiyasi	x instanceof Array

Taqqoslash operatorlari

Qiymat	Operator	Tavsif	Misol
9	<	Kichik	x < y
9	<=	Kichik yoki teng	x <= y
9	>	Katta	x > y
9	>=	Katta yoki teng	x >= y
8	==	Teng	x == y
8	===	Qat'iy teng	x === y
8	!=	Teng emas	x != y
8	!==	Qat'iy teng emas	x !== y

Bitli operatorlar

Qiymat	Operator	Tavsif	Misol
7	&	Bitli AND	x & y
6	^	Bitli XOR	x ^ y
5	|	Bitli OR	x | y

Mantiqiy operatorlar

Qiymat	Operator	Tavsif	Misol
4	&&	Mantiqiy AND	x && y
3	||	Mantiqiy OR	x || y
3	??	Nullish Coalescing (ES2020)	x ?? y

Shartli (ternar) operator

Qiymat	Operator	Tavsif	Misol
2	? :	Shart	? "ha" : "yo'q"

Tayinlash operatorlari

Tayinlashlar boshqa amallardan keyin bajariladi

Qiymat	Operator	Tavsif	Misol
2	=	Oddiy tayinlash	x = y
2	:	Ikki nuqta tayinlash	x: 5
2	+=	Qo'shish tayinlash	x += y
2	-=	Ayirish tayinlash	x -= y
2	*=	Ko'paytirish tayinlash	x *= y
2	**=	Daraja tayinlash	x **= y
2	/=	Bo'lish tayinlash	x /= y
2	%=	Qoldiq tayinlash	x %= y
2	<<=	Chapga surish tayinlash	x <<= y
2	>>=	O'ngga surish tayinlash	x >>= y
2	>>>=	Ishorasiz o'ngga surish	x >>>= y
2	&=	Bitli AND tayinlash	x &= y
2	|=	Bitli OR tayinlash	x |= y
2	^=	Bitli XOR tayinlash	x ^= y
2	&&=	Mantiqiy AND tayinlash	x &&= y
2	||=	Mantiqiy OR tayinlash	x ||= y
2	=>	Arrow	x => y
2	yield	Pauza / Davom	yield x
2	yield*	Delegat	yield* x
2	...	Spread	... x
1	,	Vergul	x , y