protoParseInt method
Implementation
int protoParseInt(a) {
if (a.length == 0) {
return -1;
}
int n = 0;
for (int i = 0; i < a.length; i++) {
if (a[i] < 48 || a[i] > 57) {
return -1;
}
int val = (a[i] - 48);
n = n * 10 + val;
}
return n;
}