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Showing content from https://webplatform.github.io/docs/javascript/String/toUpperCase below:

toUpperCase Summary

Converts all the alphabetic characters in a string to uppercase.

Syntax

strVariable.toUpperCase()

"String Literal".toUpperCase()

Examples

The following example demonstrates the effects of the toUpperCase method:

var str1 = "This is a STRING.";
 var str2 = str1.toUpperCase();
 document.write(str2);

Remarks

The toUpperCase method has no effect on non-alphabetic characters.