Can't understand why the following function works for some strings an didn't work for some which has a similar character like the first.
const change = (str,y) => (str.toLowerCase().replace(str[y],str[y].toUpperCase()));
console.log(change('London',3)); //lonDon
console.log(change('Lagos',3)); //lagOs
console.log(change('Germany',3)); //gerMany
console.log(change('Dcoder',3)); //Dcoder
console.log(change('Bobby',3)); //BobbyThe function String.prototype.replace replaces the first occurrence when the first argument is a string.
You can split the string change the index to uppercase and finally join the chars.
const change = (str, y) => {
const lowercase = str.toLowerCase().split("");
lowercase[y] = str[y].toUpperCase();
return lowercase.join("");
};
console.log(change('London',3));
console.log(change('Lagos',3));
console.log(change('Germany',3));
console.log(change('Dcoder',3));
console.log(change('Bobby',3));str[3] in "Dcoder" is 'd' and in replace the first charecter is 'D' , so than replaced you should change code to this:
const change = (str,y) => {
str = str.toLowerCase()
str=str.slice(0,y)+str[y].toUpperCase()+str.slice(y+1)
return str}
Or, in a slightly shortened manner:
const change = (str, n) =>
str.split("")
.map((c,i)=>i==n?c.toUpperCase():c.toLowerCase())
.join("");
['London','Lagos','Germany','Dcoder','Bobby'].forEach(w=>console.log(change(w,3)));