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-# bash-fun
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+# Introduction
+
+[Introduction to fun.sh library](http://ssledz.github.io/presentations/bash-fun.html#/)
+
+# Quick start
+
+```bash
+#!/bin/bash
+. <(test -e fun.sh || curl -Ls https://raw.githubusercontent.com/ssledz/bash-fun/master/src/fun.sh > fun.sh; cat fun.sh)
+
+seq 1 4 | sum
+```
+
+# Functions overview
+
+|**plus**|**append**|**buff**|**curry**|**div**|**drop**|
+|**factorial**|**filter**|**foldl**|**foldr**|**head**|**join**|
+|**lambda**|**last**|**list**|**map**|**mod**|**mul**|
+|**prepend**|**product**|**ret**|**revers_str**|**revers**|**scanl**|
+|**splitc**|**strip**|**sub**|**sum**|**tail**|**take**|
+|**catch**|**try**|**tupl**|**tupr**|**tup**|**tupx**|
+|**unlist**|**zip**|**λ**|**with_trampoline**|**res**|**call**|
+
+## *list/unlist*
+
+```bash
+$ list 1 2 3
+1
+2
+3
+
+$ list 1 2 3 4 5 | unlist
+1 2 3 4 5
+```
+
+## *take/drop/tail/head/last*
+
+```bash
+$ list 1 2 3 4 | drop 2
+3
+4
+
+$ list 1 2 3 4 5 | head
+1
+
+$ list 1 2 3 4 | tail
+2
+3
+4
+
+$ list 1 2 3 4 5 | last
+5
+
+$ list 1 2 3 4 5 | take 2
+1
+2
+```
+
+## *join*
+
+```bash
+$ list 1 2 3 4 5 | join ,
+1,2,3,4,5
+
+$ list 1 2 3 4 5 | join , [ ]
+[1,2,3,4,5]
+```
+
+## *map*
+
+```bash
+$ seq 1 5 | map λ a . 'echo $((a + 5))'
+6
+7
+8
+9
+10
+
+$ list a b s d e | map λ a . 'echo $a$(echo $a | tr a-z A-Z)'
+aA
+bB
+sS
+dD
+eE
+```
+
+## *flat map*
+
+```bash
+$ seq 2 3 | map λ a . 'seq 1 $a' | join , [ ]
+[1,2,1,2,3]
+
+$ list a b c | map λ a . 'echo $a; echo $a | tr a-z A-z' | join , [ ]
+[a,A,b,B,c,C]
+```
+
+## *filter*
+
+```bash
+$ seq 1 10 | filter λ a . '[[ $(mod $a 2) -eq 0 ]] && ret true || ret false'
+2
+4
+6
+8
+10
+```
+
+## *foldl/foldr*
+
+```bash
+$ list a b c d | foldl λ acc el . 'echo -n $acc-$el'
+a-b-c-d
+
+$ list '' a b c d | foldr λ acc el .\
+    'if [[ ! -z $acc ]]; then echo -n $acc-$el; else echo -n $el; fi'
+d-c-b-a
+```
+
+```bash
+$ seq 1 4 | foldl λ acc el . 'echo $(($acc + $el))'
+10
+```
+
+```bash
+$ seq 1 4 | foldl λ acc el . 'echo $(mul $(($acc + 1)) $el)'
+64 # 1 + (1 + 1) * 2 + (4 + 1) * 3 + (15 + 1) * 4 = 64
+
+$ seq 1 4 | foldr λ acc el . 'echo $(mul $(($acc + 1)) $el)'
+56 # 1 + (1 + 1) * 4 + (8 + 1) * 3 + (27 + 1) * 2 = 56
+```
+
+## *tup/tupx/tupl/tupr*
+
+```bash
+$ tup a 1
+(a,1)
+
+$ tup 'foo bar' 1 'one' 2
+(foo bar,1,one,2)
+
+$ tup , 1 3
+(u002c,1,3)
+```
+
+```bash
+$ tupl $(tup a 1)
+a
+
+$ tupr $(tup a 1)
+1
+
+$ tup , 1 3 | tupl
+,
+
+$ tup 'foo bar' 1 'one' 2 | tupl
+foo bar
+
+$ tup 'foo bar' 1 'one' 2 | tupr
+2
+```
+
+```bash
+$ tup 'foo bar' 1 'one' 2 | tupx 2
+1
+
+$ tup 'foo bar' 1 'one' 2 | tupx 1,3
+foo bar
+one
+
+$ tup 'foo bar' 1 'one' 2 | tupx 2-4
+1
+one
+2
+```
+
+## *buff*
+
+```bash
+$ seq 1 10 | buff λ a b . 'echo $(($a + $b))'
+3
+7
+11
+15
+19
+
+$ seq 1 10 | buff λ a b c d e . 'echo $(($a + $b + $c + $d + $e))'
+15
+40
+```
+
+## *zip*
+
+```bash
+$ list a b c d e f | zip $(seq 1 10)
+(a,1)
+(b,2)
+(c,3)
+(d,4)
+(e,5)
+(f,6)
+```
+
+```bash
+$ list a b c d e f | zip $(seq 1 10) | last | tupr
+6
+```
+
+## *curry*
+
+```bash
+add2() {
+    echo $(($1 + $2))
+}
+```
+
+```bash
+$ curry inc add2 1
+```
+
+```bash
+$ inc 2
+3
+
+$ seq 1 3 | map λ a . 'inc $a'
+2
+3
+4
+```
+
+## *try/catch*
+
+```bash
+$ echo 'expr 2 / 0' | try λ _ . 'echo 0'
+0
+
+$ echo 'expr 2 / 0' | try λ status . 'echo $status'
+2
+
+$ echo 'expr 2 / 2' | try λ _ . 'echo 0'
+1
+```
+
+```bash
+try λ  _ . 'echo some errors during pull; exit 1' < <(echo git pull)
+```
+
+```bash
+$ echo 'expr 2 / 0' \
+    | LANG=en catch λ cmd status val . 'echo cmd=$cmd,status=$status,val=$val'
+cmd=expr 2 / 0,status=2,val=(expr:,division,by,zero)
+```
+
+```bash
+$ echo 'expr 2 / 2' | catch λ _ _ val . 'tupl $val'
+1
+```
+
+## *scanl*
+
+```bash
+$ seq 1 5 | scanl lambda acc el . 'echo $(($acc + $el))'
+1
+3
+6
+10
+15
+```
+
+```bash
+$ seq 1 5 | scanl lambda a b . 'echo $(($a + $b))' | last
+15
+```
+
+## *with_trampoline/res/call*
+
+```bash
+factorial() {
+    fact_iter() {
+        local product=$1
+        local counter=$2
+        local max_count=$3
+        if [[ $counter -gt $max_count ]]; then
+            res $product
+        else
+            call fact_iter $(echo $counter\*$product | bc) $(($counter + 1)) $max_count
+        fi
+    }
+
+    with_trampoline fact_iter 1 1 $1
+}
+```
+
+```bash
+$ time factorial 30 | fold -w 70
+265252859812191058636308480000000
+
+real    0m1.854s
+user    0m0.072s
+sys     0m0.368s
+```
+
+```bash
+time factorial 60 | fold -w 70
+8320987112741390144276341183223364380754172606361245952449277696409600
+000000000000
+
+real    0m3.635s
+user    0m0.148s
+sys     0m0.692s
+```
+
+```bash
+$ time factorial 90 | fold -w 70
+1485715964481761497309522733620825737885569961284688766942216863704985
+393094065876545992131370884059645617234469978112000000000000000000000
+
+real    0m4.371s
+user    0m0.108s
+sys     0m0.436s
+```
+
+# Examples
+
+```bash
+processNames() {
+
+  uppercase() {
+     local str=$1
+     echo $(tr 'a-z' 'A-Z' <<< ${str:0:1})${str:1}
+  }
+
+  list $@ \
+    | filter λ name . '[[ ${#name} -gt 1 ]] && ret true || ret false' \
+    | map λ name . 'uppercase $name' \
+    | foldl λ acc el . 'echo $acc,$el'
+
+}
+
+processNames adam monika s slawek d daniel Bartek j k
+```
+
+```bash
+Adam,Monika,Slawek,Daniel,Bartek
+```
+
+
+# Resources
+* [Inspiration](https://quasimal.com/posts/2012-05-21-funsh.html)
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