1) a (currently) reduced set of functions:

HASH: [5] [H.lib, H.new, H.disp, H.get, H.set!]

2) building an associative array: {def H key value | ...}

{def capitals
 {H.new nyk New York, United States |
        lon London, United Kingdom |
        par Paris, France |
        mos Moscou, Russia }}
-> capitals

3) displaying: {H.disp hash}
{H.disp {capitals}}
->
[
nyk: New York, United States
lon: London, United Kingdom
par: Paris, France
mos: Moscou, Russia
]

4) getting a value from a key: {H.get hash key}

{H.get {capitals} nyk} -> New York, United States
{H.get {capitals} lon} -> London, United Kingdom
{H.get {capitals} par} -> Paris, France
{H.get {capitals} mos} -> Moscou, Russia

5) adding a new (key,value): {H.set! hash key value}

{H.disp {H.set! {capitals} bar Barcelona, Catalunya}}
->
[
nyk: New York, United States
lon: London, United Kingdom
par: Paris, France
mos: Moscou, Russia
bar: Barcelona, Catalunya
]

6) editing a key

{H.disp
  {H.set! {capitals}
          nyk
          {H.get {capitals} nyk} of America}} // adding "of America" to nyk
->
[
nyk: New York, United States of America
lon: London, United Kingdom
par: Paris, France
mos: Moscou, Russia
bar: Barcelona, Catalunya
]