# Javascript String Immutability

[**Javascript String Immutability**  
*This blog discusses String immutable property and covers a basic overview.*medium.com](https://medium.com/@codesprintpro/javascript-string-immutability-ead81df30693 "https://medium.com/@codesprintpro/javascript-string-immutability-ead81df30693")[](https://medium.com/@codesprintpro/javascript-string-immutability-ead81df30693)

let str = "hello world";  
str\[0\] = 'H';  
console.log(str); // 還是會印出 hello world，而不是 Hello world

let str = "hello world";  
str = \`${str\[0\].toUpperCase()}${str.slice(1)}\`; //重新製作字串  
console.log(str); // 這樣才會是 Hello world