Dart convert every element of list

list dart iterable
Gazihan Alankus picture Gazihan Alankus · Jun 1, 2016 · Viewed 7.3k times · Source

I have a List<String> stringValues; that are actually numbers in quotes. I want to convert this list to List<int> intValues. What's an elegant way to do this?

There is list.forEach() that does not return anything, there is iterable.expand() that returns an iterable per element, there is iterable.fold() that returns just one element for the whole list. I could not find something that will allow me to pass each element through a closure and return another list that has the return values of the closure.

Answer

G&#252;nter Z&#246;chbauer picture Günter Zöchbauer · Jun 1, 2016

Use map() and toList() for this. toList() is necessary because map() returns only an Iterable:

stringValues.map((val) => int.parse(val)).toList()

or shorter (thanks to @AlexandreArdhuin) 

stringValues.map(int.parse).toList()

Dartpad example

Related questions

Sort a list of objects in Flutter (Dart) by property value

How to sort a list of objects by the alphabetical order of one of its properties (Not the name but the actual value the property holds)?

Read More
How do I combine two lists in Dart?

I was wondering if there was an easy way to concatenate two lists in dart to create a brand new list object. I couldn't find anything and something like this: My list: list1 = [1, 2, 3] list2 = [4, 5, 6] I tried: var newList = list1 + list2; …

Read More
Dart: create a list from 0 to N

How can I create easily a range of consecutive integers in dart? For example: // throws a syntax error :) var list = [1..10];

Read More