uppercase javascript
var str = "Hello World!";
var res = str.toUpperCase(); //HELLO WORLD!uppercase javascript
var str = "Hello World!";
var res = str.toUpperCase(); //HELLO WORLD!is string javascript
function isString(value) {
return typeof value === 'string' || value instanceof String;
}
isString(''); // true
isString(1); // false
isString({}); // false
isString([]); // false
isString(new String('teste')) // trueis a letter javascript
/[a-z]/icheck if something is a letter in js
string.charAt(1).toUpperCase() !== string.charAt(1).toLowerCase()Copyright © 2021 Codeinu
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