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⚡️ Speed up function reverseString by 6,536% #1069

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⚡️ Speed up function reverseString by 6,536% #1069

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10 changes: 6 additions & 4 deletions code_to_optimize_js/string_utils.js
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Original file line number Diff line number Diff line change
Expand Up @@ -8,11 +8,13 @@
* @returns {string} - The reversed string
*/
function reverseString(str) {
let result = '';
for (let i = str.length - 1; i >= 0; i--) {
result += str[i]; // Inefficient string concatenation
// Efficient O(n) implementation using a single allocation and one join
const len = str.length;
const result = new Array(len);
for (let i = 0; i < len; i++) {
result[i] = str[len - 1 - i];
}
return result;
return result.join('');
}

/**
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