Flutter iterate through map
frid...WebThe easiest approach if you want to iterate We can extend Iterable with a new function: import 'dart:core'; extension IndexedIterable on Iterable { Iterable mapIndexed (T Function (E e, int i) f) { var i = 0; return map ( (e) => f (e, i++)); } } Usage: myList.mapIndexed ( (element, index) {}); Taken from here. Share
Flutter iterate through map
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WebApr 22, 2024 · my point is how can i iterate through this hash map. I want to do this following, for each key get the corresponding arraylist and print the values of the arraylist one by one against the key. String key = iterator.next ().toString (); ArrayList value = (ArrayList )test1.get (key) LinkedHashMap is used for preserving ordering. WebApr 7, 2024 · 2 Answers. Sorted by: 1. Move wordList to your dictionary class, it does not make sens to keep it outside and create a method inside the class to return somrthing from the list: static List> wordList = []; Then get rid of this line:
WebI have tried to go through these solutions: ... How to display list of map into DropdownMenuItem in Flutter. The first link seems to be fetching a list instead of a Map and the second displays a map whereas, in my JSON list, I have to display a value from a list of maps. ... ( child: DropdownButton( items: snapshot.data.map((value) { return new ... WebFeb 15, 2012 · Extension to properly iterate a String: extension on String { /// To iterate a [String]: `"Hello".iterable ()` Iterable iterable () sync* { for (var i = 0; i < length; i++) { yield this [i]; }}} Use it like this: expect ("Hello".iterable (), ["H", "e", "l", "l", "o"]); However, if you add the Characters package:
WebWe should iterate map based on the requirement. If we required to iterate only keys map.keys.forEach ( (k) => print ("Key : $k")); If we required to iterate only values map.values.forEach ( (v) => print ("Value: $v")); If we required to iterate both key values. map.forEach ( (k, v) => print ("Key : $k, Value : $v")); Share Improve this answer WebMay 30, 2024 · Future> getJournalEntries () async { List entries = []; await journal.get ().then ( (document) { Map data = (document.data () as Map); data.forEach ( (key, value) { print ('adding entry'); entries.add (JournalEntryData ( date: key, entryText: value ['entryText'], feeling: value ['feeling'], )); }); }); return entries; } …
WebMay 24, 2024 · 1 Answer Sorted by: 1 Future objects can be converted to Map objects by awaiting them. For example: final Future> mapFuture = mapApi.get (); final Map exampleMap = await mapFuture; All of this should be the part of an async function. Example of an async function: Future …
WebFeb 14, 2024 · This succinct, practical article shows you 2 different ways to iterate through a map in Flutter and Dart. Table Of Contents. 1 Using forEach. 2 Using for. Using forEach. Sample code:can i get windows 10 for cheaperWebIterate through the values : .values returns one iterator for map values. You can use one forEach or for-in to iterate through these values. Example using for in : main() { var numMap = Map(); numMap["one"] = 1; … fit \u0026 flare coats blackWebFeb 8, 2024 · Assuming your sectors is a Map, you can use this code. List widgets = []; for (var key in sectors.values) { //get string for text widget widgets.add (Text (string)); } This cycles through the keys in your map for (var key in sectors.values) { ... } Share Improve this answer Follow answered Feb 8, 2024 at 14:31 rapaterno 596 3 6 fit \u0026 fast mealsWebMar 4, 2024 · For accessing the values by index, there are two approaches: Get Key by index and value using the key: final key = dartques.keys.elementAt (index); final value = dartques [key]; Get value by index: final value = dartques.values.elementAt (index); You may choose the approach based on how and what data are stored on the map.can i get windows 11 to look like windows 10WebJul 18, 2024 · After Dart 2.3 you can use Collection For:. return Row(children: [for (MenuItem item in arr ) Text(item.desc)] ); Since you want to return 2 Widgets for each item in the array, you can combine this with the Spread operator:. return Row(children: [for (MenuItem item in arr ) ...[Text(item.desc),Text(item.id)]] ); can i get windows 10 freeWebDec 5, 2024 · If you are just trying to do something for one particular class, I'd just manually write: dart Map toJson () => {"id": id, "title": title, "article": article}; and then use that when you want to iterate. Share Improve this answer Follow answered Dec 5, 2024 at 10:16 lrn 61.5k 6 97 111 Add a comment 12 This bugs me almost every day. fit \u0026 flare with beltWebJan 29, 2024 · The problem is I cannot loop through the grouped data. I need to access the count for some manipulation for each grouped name. ... specific case but answering the question in case others come across this … can i get windows 11 on this laptop