Can anyone explain why my the codes output “H” if I did not add the plus sing?
e.g. reversedStr = str[i];
Here the ‘reversedStr’ itself is empty
function reverseString(str) {
for (var reversedStr = "", i = str.length - 1; i >= 0; i--) {
reversedStr += str[i];
}
return reversedStr;
}
document.write(reverseString('Hello'));
The code outputs “H” when reversedStr = str[i] because each loop reassigns the value of reversedStr. The last value assigned is “H”.
var resersedStr = ‘’ ";
reversedStr = reversedStr + str[i]; // how each loop reassigns the value by concatenating ‘reversedStr’ variable with ‘str[i]’ ?
The + symbol is not just for addition, it also concatenates strings.
Each loop takes the current value of reversedStr and concatenates the value of str[i].
You missed one. It also casts a string into a Number.
