Editing Idiom 227 : Copy a list

Idiom

# 227 Copy a list

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Lead paragraph

Create the new list y containing the same elements as the list x.

Subsequent modifications of y must not affect x (except for the contents referenced by the elements themselves if they contain pointers).

Implementation

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Imports

Implementation edit is for fixing errors and enhancing with metadata. Please do not replace the code below with a different implementation.

Instead of changing the code of the snippet, consider creating another Go implementation.

Code

y := slices.Clone(x)

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Original attribution URL

Online runnable demo

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Other implementations

y := make([]T, len(x))
copy(y, x)

Demo
Doc

let y = x.slice();

Doc
Origin

uses classes;

y.assign(x);

y = x.dup

Demo
Doc

List<T> y = x.ToList();

List<Int32> y = new List<Int32>(x);

y = x[:]

let y = x.clone();

Demo
Doc

type (foo), allocatable, dimension(:) :: y
y = x

use Storable qw(dclone);

my @y = @x; # for simple arrays

# for complex arrays with references:
my @y = @{dclone(\@x)};

Demo
Doc

y = [...x];

import java.util.ArrayList;

ArrayList<String> y = new ArrayList<>(x);

y = x.copy()

local function deepcopy(input)
 local t=type(input)
 if t~="table" then
  return input
 end
 local copy={}
 for k,v in pairs(input) do
  k=deepcopy(k)
  v=deepcopy(v)
  copy[k]=v
 end
 return copy
end
local y=deepcopy(x)

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