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How to test if a letter in a string is uppercase or lowercase using javascript?
To test if a letter in a string is uppercase or lowercase using javascript, you can simply convert the char to its respective case and see the result.
Example
function checkCase(ch) { if (!isNaN(ch * 1)){ return 'ch is numeric'; } else { if (ch == ch.toUpperCase()) { return 'upper case'; } if (ch == ch.toLowerCase()){ return 'lower case'; } } } console.log(checkCase('a')) console.log(checkCase('A')) console.log(checkCase('1'))
Output
This will give the output −
lower case upper case ch is numeric
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