Toto je starší verze dokumentu!
String.prototype.replaceAt = function(index, character) { return this.substr(0, index) + character + this.substr(index+character.length); }; var retezec = "AHOJ" for(var i = 0;i<retezec.length;i++){ console.log(retezec[i]) if (retezec[i] == "A"){ retezec.replaceAt(i,"E") } } console.log(retezec)