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Add foreach to empty list
author Michael Pavone <pavone@retrodev.com>
date Fri, 25 Jul 2014 13:43:25 -0700
parents bb4723fec05e
children 56deb4a102db
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1 {
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2 _empty <- #{
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3 length <- { 0 }
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4 empty? <- { true }
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5 fold:with <- :acc :fun { acc }
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6 foldr:with <- :acc :fun { acc }
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7 foreach <- :self fun { self }
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8 map <- :fun { self }
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9 | <- :val {
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10 list node: val withTail: self
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11 }
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12 . <- :right { right }
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13 reverse <- { self }
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14 join <- { "" }
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15 contains? <- :val { false }
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16 string <- { "[]" }
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17 print <- { print: string }
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18 jsonEncode <- { "[]" }
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19 }
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20 #{
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21 empty <- { _empty }
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22 node:withTail <- :_val :_tail {
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23 #{
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24 value <- { _val }
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25 tail <- { _tail }
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26 empty? <- { false }
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27 length <- {
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28 fold: 0 with: :acc val { acc + 1 }
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29 }
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30 fold:with <- :acc :fun {
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31 cur <- self
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32 while: { not: (cur empty?)} do: {
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33 acc <- fun: acc (cur value)
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34 cur <- cur tail
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35 }
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36 acc
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37 }
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38 foldr:with <- :acc fun {
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39 fun: (_tail foldr: acc with: fun) _val
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40 }
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41 map <- :fun {
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42 node: (fun: _val) withTail: (_tail map: fun)
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43 }
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44 foreach <- :self fun {
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45 fold: 0 with: :idx el{
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46 fun: idx el
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47 idx + 1
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48 }
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49 self
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50 }
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51 | <- :val {
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52 node: val withTail: self
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53 }
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54 . <- :right {
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55 foldr: right with: :tail val {
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56 node: val withTail: tail
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57 }
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58 }
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59 reverse <- {
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60 fold: [] with: :tail val {
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61 node: val withTail: tail
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62 }
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63 }
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64 join <- :sep {
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65 _tail fold: (string: _val) with: :acc el {
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66 acc . sep . el
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67 }
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68 }
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69 contains? <- :val {
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70 if: _val = val {
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71 true
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72 } else: {
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73 _tail contains?: val
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74 }
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75 }
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76 string <- {
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77 (fold: "[\n" with: :acc el {
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78 acc . " " . (string: el) . "\n"
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79 }) . "]"
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80 }
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81 print <- {
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82 print: "[\n"
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83 foreach: :_ el {
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84 print: " " . (string: el) . "\n"
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85 }
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86 print: "]"
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87 }
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88
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89 jsonEncode <- {
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90 parts <- map: :el { json encode: el }
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91 "[" . (parts join: ",") . "]"
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92 }
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93 }
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94 }
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95 }
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96 }