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Funktsiya orqali filtrlash

Bizda massivlar uchun o’rnatilgan arr.filter(f) usuli mavjud. U barcha elementlarni f funktsiyasi orqali filtrlaydi. Agar u true ni qaytarsa, u holda element olingan massivda qaytariladi.

“Foydalanishga tayyor” filtrlar to’plamini yarating:

inBetween(a, b) – a va b o’rtasida yoki ularga teng (shu jumladan).
inArray([...]) – berilgan massivda.

Foydalanish shunday bo’lishi kerak:

arr.filter(inBetween(3,6)) – faqat 3 dan 6 gacha bo’lgan qiymatlarni tanlaydi.
arr.filter(inArray([1,2,3])) – faqat [1,2,3] a’zolaridan biriga mos elementlarni tanlaydi.

Masalan:

/* .. sizning kodingiz inBetween va inArray uchun */
let arr = [1, 2, 3, 4, 5, 6, 7];

alert(arr.filter(inBetween(3, 6))); // 3,4,5,6

alert(arr.filter(inArray([1, 2, 10]))); // 1,2

Sinovlar bilan sandbox-ni oching.

Filtr inBetween

function inBetween(a, b) {
  return function (x) {
    return x >= a && x <= b;
  };
}

let arr = [1, 2, 3, 4, 5, 6, 7];
alert(arr.filter(inBetween(3, 6))); // 3,4,5,6

Filtr inArray

function inArray(arr) {
  return function (x) {
    return arr.includes(x);
  };
}

let arr = [1, 2, 3, 4, 5, 6, 7];
alert(arr.filter(inArray([1, 2, 10]))); // 1,2

Yechimni sandbox-dagi sinovlar bilan oching.

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