JS taqqoslash operatorlari

Taqqoslash operatorlari

Taqqoslash operatorlari ikkita qiymatni solishtirish uchun ishlatiladi.

Taqqoslash operatorlari har doim true yoki false qaytaradi.

x = 5 ekanligini hisobga olib, quyidagi jadvalda taqqoslash operatorlari tushuntiriladi:

Operator	Tavsif	Comparing	Qaytaradi
==	teng	x == 8	false	Try it »
		x == 5	true	Try it »
		x == "5"	true	Try it »
===	qiymati va tipi teng	x === 5	true	Try it »
		x === "5"	false	Try it »
!=	teng emas	x != 8	true	Try it »
!==	teng qiymatga ega emas yoki teng emas	x !== 5	false	Try it »
		x !== "5"	true	Try it »
		x !== 8	true	Try it »
>	katta belgisi	x > 8	false	Try it »
<	kichik belgisi	x < 8	true	Try it »
>=	katta yoki teng	x >= 8	false	Try it »
<=	kichik yoki teng	x <= 8	true	Try it »

Taqqoslash operatorlari qiymatlarni solishtirish va natijaga qarab harakat qilish uchun shartli iboralarda ishlatilishi mumkin:

if (age < 18) text = "Too young to buy alcohol";

Siz ushbu qo‘llanmaning if...else bo‘limida shartli gaplardan foydalanish haqida ko‘proq bilib olasiz.

JavaScript stringlarini taqqoslash

Yuqoridagi barcha taqqoslash operatorlarini stringlarda ham ishlatish mumkin:

Misol

let text1 = "A";
let text2 = "B";
let result = text1 < text2;

O‘zingiz sinab ko‘ring »

Stringlar alifbo tartibida taqqoslanishiga e’tibor bering:

Misol

let text1 = "20";
let text2 = "5";
let result = text1 < text2;

O‘zingiz sinab ko‘ring »

Har xil turlarni solishtirish

Turli turdagi ma’lumotlarni solishtirish kutilmagan natijalar berishi mumkin.

Stringni son bilan solishtirganda, JavaScript taqqoslash paytida stringni songa aylantiradi. Bo‘sh string 0 ga aylanadi. Raqamli bo‘lmagan string har doim false bo‘lgan NaN ga aylanadi.

Case	Qiymat	Try
2 < 12	true	Try it »
2 < "12"	true	Try it »
2 < "John"	false	Try it »
2 > "John"	false	Try it »
2 == "John"	false	Try it »
"2" < "12"	false	Try it »
"2" > "12"	true	Try it »
"2" == "12"	false	Try it »

Ikki stringni solishtirganda, "2" "12" dan katta bo‘ladi.

Alfavit tartibida 1 21 dan kichik.

To‘g‘ri natijani ta’minlash uchun o‘zgaruvchilar taqqoslashdan oldin tegishli turga aylantirilishi kerak:

Misol

age = Number(age);
if (isNaN(age)) {
voteable = "Input is not a number";
} else {
voteable = (age < 18) ? "Too young" : "Old enough";
}

O‘zingiz sinab ko‘ring »

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