Check name of list key and change it - flutter

Question

I am trying to check the name of a key in a list and then change the name if it meets a certain criteria.
My code so far is:
String convert(double key) {
if(key == '1') {
return "One";
} else if(key == '2') {
return "Two";
}
//This the the list loop:
for (var entry in optoins.entries) {
entry.key = convert(entry.key); //This seems to be incorrect
if (entry.key == "One") {
//do somehting
}
}
The error I get is this one:
The argument type 'String' can't be assigned to the parameter type 'double'.
I know I can do if (entry.key == "1") but later in the code I need entry.key to be a string One and not 1, so I would like to change the name before starting the if else check.

Answer 1

The problem is your code entry.key is a double variable and not a string. I would suggest adding a new field to the entry class called stringKey and store this value there. That would be something like
String convert(String key) {
if(key == '1') {
return "One";
} else if(key == '2') {
return "Two";
}
//This the the list loop:
for (var entry in optoins.entries) {
entry.stringKey= convert(str(entry.key)); //This seems to be incorrect
if (entry.stringKey== "One") {
//do somehting
}
}