Njia za Iteration kwenye Array katika JavaScript

Array za JavaScript zinatoa zana nyingi za kushughulikia data. Unapaswa kuzijua njia hizi ili kuandika kodi safi.

  • forEach() Hurunisha function kwa kila kipengele. let nums = [10, 20, 30]; nums.forEach(num => console.log(num));

  • map() Hutengeneza array mpya kwa kubadilisha kila kipengele. let nums = [1, 2, 3]; let result = nums.map(num => num * 2); // [2, 4, 6]

  • flatMap() Hufanya mapping kwa kila kipengele kisha huunganisha matokeo. let arr = [1, 2, 3]; let result = arr.flatMap(num => [num, num * 2]); // [1, 2, 2, 4, 3, 6]

  • filter() Hutengeneza array mpya yenye vipengele vinavyopita jaribio. let nums = [10, 20, 30, 40]; let result = nums.filter(num => num > 20); // [30, 40]

  • reduce() Huunganisha vipengele vyote kuwa thamani moja. let nums = [10, 20, 30]; let result = nums.reduce((total, num) => total + num, 0); // 60

  • reduceRight() Inafanya kazi kama reduce lakini inaanza kutoka mwisho wa array. let arr = ["A", "B", "C"]; let result = arr.reduceRight((acc, value) => acc + value); // CBA

  • every() Hurudisha true ikiwa vipengele vyote vinapita jaribio. let nums = [10, 20, 30]; let result = nums.every(num => num > 5); // true

  • some() Hurudisha true ikiwa angalau kipengele kimoja kinapita jaribio. let nums = [10, 20, 30]; let result = nums.some(num => num > 25); // true

  • from() Hutengeneza array kutoka kwenye kitu kinachoweza kufanyiwa iteration (iterable object). let result = Array.from("Hello"); // ['H', 'e', 'l', 'l', 'o']

  • keys() Hurudisha iterator yenye funguo (keys) za array. let fruits = ["Apple", "Mango", "Orange"]; let result = fruits.keys(); // 0, 1, 2

  • entries() Hurudisha iterator yenye jozi za funguo na thamani (key and value pairs). let fruits = ["Apple", "Mango", "Orange"]; let result = fruits.entries(); // [0, 'Apple'], [1, 'Mango']...

  • with() Hurudisha array mpya ambapo kipengele kimoja kimebadilishwa. let fruits = ["Apple", "Mango", "Orange"]; let result = fruits.with(1, "Grapes"); // ['Apple', 'Grapes', 'Orange']

  • Spread (...) Hupanua vipengele vya array. let arr1 = [1, 2]; let arr2 = [3, 4]; let result = [...arr1, ...arr2]; // [1, 2, 3, 4]

  • Rest (...) Hukusanya vipengele vingi kuwa array moja. function showNumbers(...nums) { console.log(nums); } showNumbers(10, 20, 30); // [10, 20, 30]

Chanzo: https://dev.to/ezhil_abinayak_e38eec8fb/array-iteration-methods-in-javascript-20mc