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Idiom #7 Iterate over list indexes and values
Print each index i with its value x from an array-like collection items
Tóm lược đại ý quan trọng trong bài
- Idiom #7 Iterate over list indexes and values
- Dart
- Dart
- Ada
- C
- Caml
- Clojure
- C++
- C++
- C#
- C#
- C#
- D
- D
- Elixir
- Erlang
- Fortran
- Go
- Groovy
- Haskell
- JS
- JS
- Java
- Java
- Kotlin
- Lisp
- Lua
- Obj-C
- PHP
- Pascal
- Pascal
- Perl
- Python
- Ruby
- Ruby
- Rust
- Rust
- Scala
- Scheme
- Smalltalk
- VB
- VB
- Dart
items.asMap().forEach((i, value)
print(‘index=$i, value=$value’);
);
- Demo
- Doc
- Dart
for (var i = 0; i < items.length; i++)
print('index=$i, value=$items[i]');
- Demo
- Ada
- C
- Caml
- Clojure
- C++
- C++
- C#
- C#
- C#
- D
- D
- Elixir
- Erlang
- Fortran
- Go
- Groovy
- Haskell
- JS
- JS
- Java
- Java
- Kotlin
- Lisp
- Lua
- Obj-C
- PHP
- Pascal
- Pascal
- Perl
- Python
- Ruby
- Ruby
- Rust
- Rust
- Scala
- Scheme
- Smalltalk
- VB
- VB
with Ada.Text_IO;
use Ada.Text_IO;for I in Items’Range loop
X := Items (I);
Put_Line (Integer’Image (I) & ” ” & Integer’Image (X));
end loop;
for (size_t i = 0; i < n; i++)
printf("Item %d = %sn", i, toString(items[i]));
(* output_elem is a printer for elements of [items] *)
items |> List.iteri (fun i x ->
printf “%d: %a” i output_elem x
)
(doseq [[i x] (map-indexed vector items)]
(println i “:” x))
- Doc
#include for (std::size_t ix = 0; ix < items.size(); ++ix)
std::cout << "Item " << ix << " = " << items[ix] << std::endl;
#include std::size_t i = 0;
for(const auto & x: items)
std::cout << "Item " << i++ << " = " << x << std::endl;
- Doc
using System;for (int i = 0; i < items.Length; i++)
Console.WriteLine($"i items[i]");
using System.Collections.Generic;foreach (var (i, x) in items.AsIndexed())
System.Console.WriteLine($”i: x”);
public static class Extensions
public static IEnumerable AsIndexed(
this IEnumerable source)
var index = 0;
foreach (var item in source)
yield return (index++, item);
- Demo
using System.Linq;foreach (var (x, i) in items.Select((x, i)=>(x, i)))
System.Console.WriteLine($”i: x”);
- Demo
- Doc
- Origin
import std.stdio, std.algorithm;
import std.range;items.enumerate.each!(a => writeln(“i = “, a[0], ” value = “, a[1]));
- Demo
- Doc
import std.stdio;foreach(i, x; items)
writefln(“%s: %s”, i, x);
items
|> Enum.with_index
|> Enum.each(fn(x, i) ->
IO.puts(“#i => #x”)
end)
- Doc
WithIndex =
lists:zip(lists:seq(1, length(Items)), Items),
io:format(“~p.~n”, [WithIndex]).
- Demo
- Doc
do i=1, size(items)
print *,i, items(i)
end do
import “fmt”for i, x := range items
fmt.Printf(“Item %d = %v n”, i, x)
- Demo
- Doc
items.eachWithIndex
x, i -> println “Item $i = $x”
- Demo
mapM_ print (zip [0..] items)
for (var i in items)
console.log(“index=” + i + “, value=” + items[i]);
items.forEach((val, idx) =>
console.log(“index=” + idx + “, value=” + val);
);
- Doc
for (int i = 0; i < items.size(); i++)
T x = items.get(i);
System.out.printf("Item %d = %s%n", i, x);
for (int i = 0; i < items.length; i++)
T x = items[i];
System.out.printf("Item %d = %s%n", i, x);
items.forEachIndexed i, x ->
print(“i=$i x=$x”)
(loop for i from 0 and x across items
do (format t “~a = ~a~%” i x))
for i, x in ipairs(items) do
print(‘Index: ‘..i..’, Value: ‘..x)
end
@import Foundation;[items enumerateObjectsUsingBlock:^(id x, NSUInteger i, BOOL *stop)
NSLog(@”Item %lu = %@”,(u_long)i,x);
];
foreach ($items as $i=>$x)
echo “i=$i, x=$x”; echo ‘
‘;
var I:Integer;
Items: array of String;
[..]
for I := 0 to high(Items) do
WriteLn(‘Item ‘, I, ‘ = ‘, Items[I]);
uses Classes, SysUtils;var I:Integer;
Items: array of TObject;
[…]
for I := 0 to high(Items) do
if assigned(Items[I]) then
WriteLn(Format(‘Item %d = %s’, [I, Items[I].ToString]));
use 5.012; # each @array# For an array
while (my ($idx, $val) = each @array)
print “array[$idx] = $valn”;
# For a hash
while (my ($key, $val) = each %hash)
print “hash$key = $valn”;
- Doc
for i, x in enumerate(items):
print i, x
- Doc
- Origin
items.each_with_index do |x, i|
puts “Item #i = #x”
end
items.each_indexi
for (i, x) in items.iter().enumerate()
println!(“Item = “, i, x);
- Demo
- Doc
items.iter().enumerate().for_each(|(i, x)|
println!(“Item = “, i, x);
)
- Demo
- Doc
val items = List(“a”, “b”, “c”)
items.zipWithIndex.foreach case (item, index) =>
println(s”$index => $item”)
(define (display-list items)
(define (display-list items i)
(if (not (null? items))
(begin
(display (string-append
(number->string i)
“: ”
(number->string (first items))
“n”))
(display-list (rest items) (+ i 1)))
‘done))
(display-list items 0))
items withIndexDo: [:item :index |
Transcript showln: ‘item: ‘ , item , ‘ index: ‘ , index].
Imports SystemFor i As Integer = 0 To items.Length – 1
Dim x = items(i)
Console.WriteLine($”Item i = x”)
Next
- Demo
Imports SystemFor i As Integer = 0 To items.Count – 1
Dim x = items(i)
Console.WriteLine($”Item i = x”)
Next
- Demo
Do you know the best way to do this in your language ? New implementation…Idiom created by programming-idioms.orgHistory
- View revisions
Related idioms
- Iterate over list values
- Create a new list
- Add an element at the end of a list
- Traverse list backwards
- Iterate over characters of a string
Issues
- Report a bug
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Hỏi đáp vướng mắc về Get index of item in list dart
You trọn vẹn có thể để lại phản hồi nếu gặp yếu tố chưa hiểu nhé.
#index #item #list #dart
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