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⚡️ Speed up function toTitleCase by 13% #1087

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⚡️ Speed up function toTitleCase by 13% #1087

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25 changes: 20 additions & 5 deletions code_to_optimize_js/string_utils.js
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Original file line number Diff line number Diff line change
Expand Up @@ -79,11 +79,26 @@ function longestCommonPrefix(strs) {
* @returns {string} - The title-cased string
*/
function toTitleCase(str) {
return str
.toLowerCase()
.split(' ')
.map(word => word.charAt(0).toUpperCase() + word.slice(1))
.join(' ');
if (!str) return str;

let result = '';
let capitalizeNext = true;

for (let i = 0, len = str.length; i < len; i++) {
const char = str[i];

if (char === ' ') {
result += char;
capitalizeNext = true;
} else if (capitalizeNext) {
result += char.toUpperCase();
capitalizeNext = false;
} else {
result += char.toLowerCase();
}
}

return result;
}

module.exports = {
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