How to convert list<String> into String in Dart without iteration?

问题

Is there a method in Dart like the String.join() method in Java & c#?

input:

nums: ["20",  "3005",  "2"]

output:

nums = "2030052"

回答1:

join is a method of the List class, rather than String:

List<String> yourList = ["20", "3005", "2"];

// To test that the above the above
yourList.join() == '2030052';     // true
yourList.join(',') == '20,3005,2'; // true, with "," delimiter

回答2:

This might not be the best solution, but you can reduce a collection to a single value by iteratively combining elements of the collection using the reduce method in Dart Lists.

String nums = numsList.reduce((value, element) => value + ',' + element);

You have to remember that, the iterable must have at least one element. If it has only one element, that element is returned.

来源：https://stackoverflow.com/questions/48014624/how-to-convert-liststring-into-string-in-dart-without-iteration