lambdaway :: JSON

3 | list | login |load

| |

_img http://c2.com/ward/ascent.jpg 
{center [[the ascent of ward|http://found.ward.bay.wiki.org/view/the-ascent-of-ward]]}

{pre 
'{def WC Ward Cunningham}
-> {def WC Ward Cunningham}

'{S.first {WC}}
-> {S.first {WC}}
'{S.last {WC}}
-> {S.last {WC}}

{quote {b {W.first {S.first {WC}}}}{sup {W.rest {S.first {WC}}}}.
{b {W.first {S.last {WC}}}}{sup {W.rest {S.last {WC}}}}.}
-> {b {W.first {S.first {WC}}}}{sup {W.rest {S.first {WC}}}}.{b {W.first {S.last {WC}}}}{sup {W.rest {S.last {WC}}}}.
°°°
2) array

'{def AWC 
 {A.new Ward Cunningham}}
-> {def AWC 
 {A.new Ward Cunningham}}
'{AWC}
-> {AWC}
'{A.get 0 {AWC}}
-> {A.get 0 {AWC}}
'{A.get 1 {AWC}}
-> {A.get 0 {AWC}}

3) associative array

'{def HWC
 {H.new first_name Ward | 
        last_name Cunningham}}
-> {def HWC {H.new first_name Ward | last_name Cunningham}}
'{H.disp {HWC}}
-> {H.disp {HWC}}
'{H.get {HWC} first_name}
-> {H.get {HWC} first_name}
'{H.get {HWC} last_name}
-> {H.get {HWC} last_name}
°°°
}

{hr}

_h1 XML | JSON | LT

_p Comparing structured datas built with XML, JSON and '{lambda talk}.

_h2 1) XML

{pre 
1) building the structure
<{span}individu>
  <{span}firstName> John  <{span}/firstName>
  <{span}lastName>  Smith <{span}/lastName>
  <{span}isAlive>   true  <{span}/isAlive>
  <{span}age>       27    <{span}/age>
  <{span}address>
    <{span}streetAddress> 21 2nd Street <{span}/streetAddress>
    <{span}city>          New York      <{span}/city> 
    <{span}state>         NY            <{span}/state>
    <{span}postalCode>    10021-3100    <{span}/postalCode>
  <{span}/address>
  <{span}phoneNumbers> 
    <{span}1>
      <{span}type>   home         <{span}/type>
      <{span}number> 212 555-1234 <{span}/number>
    <{span}/1>
    <{span}2>
      <{span}type>   office       <{span}/type>
      <{span}number> 646 555-4567 <{span}/number>
    <{span}/2>
  <{span}/phoneNumbers>
  <{span}children> 
    <{span}1> Jules   <{span}/1> 
    <{span}2> Lucie   <{span}/2> 
    <{span}3> Cyrille <{span}/3> 
  <{span}children>
  <{span}spouse> Candice <{span}/spouse>
<{span}/individu>

2l getting datas:

document.getElementByTagName("individu > firstName")[0].innerHTML 
-> John
document.getElementByTagName("individu > chidren > 1").innerHTML 
-> Jules
...
}

_h2 2) JSON

{pre °°
1) building the JSON element

var individu = {
  "firstName": "John",
  "lastName":  "Smith",
  "isAlive":   true,
  "age":       27,
  "address": {
    "streetAddress": "21 2nd Street",
    "city":          "New York",
    "state":         "NY",
    "postalCode":    "10021-3100"
  },
  "phoneNumbers": [
    {
      "type":   "home",
      "number": "212 555-1234"
    },
    {
      "type":   "office",
      "number": "646 555-4567"
    }
  ],
  "children": ["Jules","Julie","Cyrille"],
  "spouse":   "Candice"
}

2) getting data:

individu.firstName 
-> "John"
individu.children[0] 
-> "Jules"
...

°°}

_h2 3) '{lambda talk}

_p We can use associative arrays (hashes)  defined in a small libray {b [[lib_hash]]}, a wiki page containing 5 functions:

{center {H.lib} }

{require lib_hash}

{pre

1) buiding the structure:

'{def individu
 {H.new firstName    John | 
        lastName     Smith |
        isAlive      true |
        age          27 |
        address      {H.new streetAddress 21 2nd Street |
                            city          New York |
                            state         NY |
                            postalCode    10021-3100} |
        phoneNumbers {H.new 1 {H.new type   home |   
                                     number 212 555-1234} |  
                            2 {H.new type   office |
                                     number 646 555-4567}} |
        children     {H.new 1 Jules |
                            2 Lucie |
                            3 Cyrille} |
        spouse       Candice
}} 
-> {def individu
 {H.new firstName    John                                 | 
        lastName     Smith                                |
        isAlive      true                                 |
        age          27                                   |
        address      {H.new streetAddress 21 2nd Street   |
                            city          New York        |
                            state         NY              |
                            postalCode    10021-3100 
                     }                                    |
        phoneNumbers {H.new 1 {H.new type   home          |   
                                     number 212 555-1234  
                              }                           |  
                            2 {H.new type   office        |
                                     number 646 555-4567
                              } 
                     }                                    |
        children     {H.new 1 Jules                       |
                            2 Lucie                       |
                            3 Cyrille
                     }                                    |
        spouse       Candice
}}

2) getting datas:

'{H.get {individu} firstName} 
-> {H.get {individu} firstName}

'{H.get {H.get {individu} address} streetAddress}
-> {H.get {H.get {individu} address} streetAddress}

'{H.get {H.get {H.get {individu} phoneNumbers} 1} number} 
-> {H.get {H.get {H.get {individu} phoneNumbers} 1} number}

'{H.disp {H.get {individu} children}}
-> {H.disp {H.get {individu} children}}

'{H.get {H.get {individu} children} 1}
-> {H.get {H.get {individu} children} 1}

}

_h2 todo

_p Using some special form ({i still to be written}) translating {code [name value]} into {code '{H.new name value}} and {code '{get name field}} into {code '{H.get name field}} we could build the structure more simply

{pre
'{def individu 
 [hash
  [firstName John]
  [lastName  Smith]
  [isAlive   true]
  [age       27]
  [address
    [streetAddress> 21 2nd Street]
    [city>          New York]
    [state>         NY]
    [postalCode>    10021-3100]]
  [phoneNumbers
    [1 [type   home]
       [number 212 555-1234]]
    [2 [type   office]
       [number 646 555-4567]]]
  [children
    [1 Jules]
    [2 Lucie]
    [3 Cyrille]]
  [spouse Candice]
 ]
}
}

_p and get values this way

{pre
'{get individu firstName}
-> John

'{get individu {get address streetAddress}}
-> 21 2nd Street

'{get individu {get phoneNumbers {get 1  number}}}
-> 212 555-1234

'{get individu children}
-> [Jules,Lucie,Cyrille]

'{get individu {get children 1}}
-> Jules

}

_h2 refs
_ul [[http://ward.asia.wiki.org/view/how-wiki-works/view/json-schema|http://ward.asia.wiki.org/view/how-wiki-works/view/json-schema]]
_ul [[https://webdatarender.com/|https://webdatarender.com/]]