Javascript String toUpperCase()

Introduction

Javascript String toUpperCase() converts string to upper case. 

str.toUpperCase()

The converted string is returned from the method and leaves the original string unchanged. 

let stringValue = "hello WORLD"; 
let a = stringValue.toUpperCase();
console.log(a);  // "HELLO WORLD" 
console.log(stringValue);/*from www .j  ava 2s  .c  o m*/



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