Creating implementation for idiom 329 : Read value in a map

Idiom

# 329 Read value in a map

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Lead paragraph

Assign to v the value stored in the map m for the key k.

Explain what happens if there is no entry for k in m.

New implementation

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Other implementations

var v = m[k];

v, ok := m[k]

v := m[k]

v = m.get(k);

m.getOrDefault(k, null);

v = m.get(k);

local v=m[k]

fgl

Type
  TMap = specialize TFPGMap<TKey, TData>;

var
  m: TMap;

...
  if not m.TryGetData(k,v) then ;

$v = $m{$k} // 'foobar';

$v = $m{$k};

v = m.get(k)

v = m.get(k, "default value")

v = m[k]

default = 123
try:
    v = m[k]
except KeyError:
    v = default

default = 123
v = m.get(k) or default

default = 123
v = m.get(k, default)

v = m[k]

use std::collections::HashMap;

let v = m.get(&k);