{"id":3404,"date":"2026-09-12T13:13:36","date_gmt":"2026-09-12T12:13:36","guid":{"rendered":"https:\/\/codeflarelimited.com\/blog\/?p=3404"},"modified":"2026-09-12T13:13:38","modified_gmt":"2026-09-12T12:13:38","slug":"10-ways-to-loop-through-a-javascript-array","status":"publish","type":"post","link":"https:\/\/codeflarelimited.com\/blog\/10-ways-to-loop-through-a-javascript-array\/","title":{"rendered":"10 Ways to Loop Through a JavaScript Array"},"content":{"rendered":"\n

JavaScript gives you several ways to iterate over an array<\/a>. Some are better for simple iteration, while others are designed for transforming, filtering, searching, or reducing data.<\/p>\n\n\n\n

Learn software development<\/a><\/p>\n\n\n\n

Assume we have this array:<\/p>\n\n\n\n

const fruits = [\"Apple\", \"Banana\", \"Mango\", \"Orange\"];<\/code><\/pre>\n\n\n\n
1. for<\/code> Loop<\/h2>\n\n\n\n
The classic approach gives you complete control over the index.<\/p>\n\n\n\n
for (let i = 0; i < fruits.length; i++) {\n  console.log(fruits[i]);\n}<\/code><\/pre>\n\n\n\n
Best for:<\/strong> When you need the index or precise control over the loop.<\/p>\n\n\n\n
2. for...of<\/code><\/h2>\n\n\n\n
for...of<\/code> provides a clean way to access each array value directly.<\/p>\n\n\n\n
for (const fruit of fruits) {\n  console.log(fruit);\n}<\/code><\/pre>\n\n\n\n
Best for:<\/strong> Simple iteration when you don’t need the index.<\/p>\n\n\n\n
3. forEach()<\/code><\/h2>\n\n\n\n
forEach()<\/code> executes a function for every element.<\/p>\n\n\n\n
fruits.forEach((fruit) => {\n  console.log(fruit);\n});<\/code><\/pre>\n\n\n\n
You can also access the index:<\/p>\n\n\n\n
fruits.forEach((fruit, index) => {\n  console.log(index, fruit);\n});<\/code><\/pre>\n\n\n\n
Best for:<\/strong> Performing an action for every element.<\/p>\n\n\n\n
4. for...in<\/code><\/h2>\n\n\n\n
for...in<\/code> iterates over the array’s enumerable property keys.<\/p>\n\n\n\n
for (const index in fruits) {\n  console.log(fruits[index]);\n}<\/code><\/pre>\n\n\n\n
Best for:<\/strong> Object properties. It generally isn’t the preferred choice for arrays because it iterates keys rather than array values.<\/p>\n\n\n\n
5. map()<\/code><\/h2>\n\n\n\n
map()<\/code> loops through an array and creates a new array<\/strong> containing the returned values.<\/p>\n\n\n\n
const upperFruits = fruits.map((fruit) => {\n  return fruit.toUpperCase();\n});\n\nconsole.log(upperFruits);<\/code><\/pre>\n\n\n\n
Output:<\/p>\n\n\n\n
[\"APPLE\", \"BANANA\", \"MANGO\", \"ORANGE\"]<\/code><\/pre>\n\n\n\n
Best for:<\/strong> Transforming every element.<\/p>\n\n\n\n
6. filter()<\/code><\/h2>\n\n\n\n
filter()<\/code> loops through the array and creates a new array containing only elements that satisfy a condition.<\/p>\n\n\n\n
const longNames = fruits.filter((fruit) => {\n  return fruit.length > 5;\n});\n\nconsole.log(longNames);<\/code><\/pre>\n\n\n\n
Best for:<\/strong> Selecting specific elements from an array.<\/p>\n\n\n\n
7. reduce()<\/code><\/h2>\n\n\n\n
reduce()<\/code> processes every element while accumulating a single result.<\/p>\n\n\n\n
const numbers = [10, 20, 30, 40];\n\nconst total = numbers.reduce((sum, number) => {\n  return sum + number;\n}, 0);\n\nconsole.log(total); \/\/ 100<\/code><\/pre>\n\n\n\n
Best for:<\/strong> Calculating totals, building objects, grouping data, and other accumulations.<\/p>\n\n\n\n
8. while<\/code> Loop<\/h2>\n\n\n\n
You can manually control iteration with a while<\/code> loop.<\/p>\n\n\n\n
let i = 0;\n\nwhile (i < fruits.length) {\n  console.log(fruits[i]);\n  i++;\n}<\/code><\/pre>\n\n\n\n
Best for:<\/strong> Situations where the stopping condition needs more flexible control.<\/p>\n\n\n\n
9. do...while<\/code> Loop<\/h2>\n\n\n\n
A do...while<\/code> loop executes its body at least once<\/strong> before checking the condition.<\/p>\n\n\n\n
let i = 0;\n\ndo {\n  console.log(fruits[i]);\n  i++;\n} while (i < fruits.length);<\/code><\/pre>\n\n\n\n
Best for:<\/strong> Cases where the loop body must execute at least once.<\/p>\n\n\n\n
10. Array.entries()<\/code><\/h2>\n\n\n\n
entries()<\/code> returns an iterator containing [index, value]<\/code> pairs.<\/p>\n\n\n\n
for (const [index, fruit] of fruits.entries()) {\n  console.log(index, fruit);\n}<\/code><\/pre>\n\n\n\n
Output:<\/p>\n\n\n\n
0 Apple\n1 Banana\n2 Mango\n3 Orange<\/code><\/pre>\n\n\n\n
Best for:<\/strong> When you want both the index and value while using modern iteration syntax.<\/p>\n\n\n\n
Quick Comparison<\/h2>\n\n\n\n
Method<\/th>Returns New Array?<\/th>Gets Index Easily?<\/th>Common Use<\/th><\/tr><\/thead>
for<\/code><\/td>No<\/td>Yes<\/td>Full control<\/td><\/tr>
for...of<\/code><\/td>No<\/td>No<\/td>Simple iteration<\/td><\/tr>
forEach()<\/code><\/td>No<\/td>Yes<\/td>Perform an action<\/td><\/tr>
for...in<\/code><\/td>No<\/td>Yes<\/td>Object keys<\/td><\/tr>
map()<\/code><\/td>Yes<\/td>Yes<\/td>Transform data<\/td><\/tr>
filter()<\/code><\/td>Yes<\/td>Yes<\/td>Select data<\/td><\/tr>
reduce()<\/code><\/td>No<\/td>Yes<\/td>Accumulate data<\/td><\/tr>
while<\/code><\/td>No<\/td>Yes<\/td>Flexible conditions<\/td><\/tr>
do...while<\/code><\/td>No<\/td>Yes<\/td>Run at least once<\/td><\/tr>
entries()<\/code> + for...of<\/code><\/td>No<\/td>Yes<\/td>Index + value<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
The important distinction<\/h3>\n\n\n\n
Don’t think of these as simply 10 different ways to do the same thing<\/strong>.<\/p>\n\n\n\n
    \n
  • Need maximum control?<\/strong>\u00a0\u2192\u00a0for<\/code><\/li>\n\n\n\n
  • Just need each value?<\/strong>\u00a0\u2192\u00a0for...of<\/code><\/li>\n\n\n\n
  • Perform an action for every item?<\/strong>\u00a0\u2192\u00a0forEach()<\/code><\/li>\n\n\n\n
  • Transform every item?<\/strong>\u00a0\u2192\u00a0map()<\/code><\/li>\n\n\n\n
  • Keep matching items?<\/strong>\u00a0\u2192\u00a0filter()<\/code><\/li>\n\n\n\n
  • Produce one accumulated result?<\/strong>\u00a0\u2192\u00a0reduce()<\/code><\/li>\n\n\n\n
  • Need index + value with modern syntax?<\/strong>\u00a0\u2192\u00a0entries()<\/code><\/li>\n\n\n\n
  • Need a custom stopping condition?<\/strong>\u00a0\u2192\u00a0while<\/code>\u00a0\/\u00a0do...while<\/code><\/li>\n<\/ul>\n\n\n\n
    One especially important rule: don’t use map()<\/code>, filter()<\/code>, or reduce()<\/code> merely because they loop. Choose them when their purpose matches what you’re trying to accomplish.<\/strong><\/p>\n\n\n\n
     <\/p>\n","protected":false},"excerpt":{"rendered":"
    JavaScript gives you several ways to iterate over an array. Some are better for simple iteration, while others<\/p>\n","protected":false},"author":1,"featured_media":3405,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[11,24,98],"tags":[],"class_list":["post-3404","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-javascript","category-programming","category-softare-development"],"yoast_head":"\n10 Ways to Loop Through a JavaScript Array<\/title>\n<meta name=\"description\" content=\"JavaScript gives you several ways to iterate over an array. 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