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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
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  • C++
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  • 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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You trọn vẹn có thể để lại phản hồi nếu gặp yếu tố chưa hiểu nhé.
#index #item #list #dart