47 lines
785 B
Bash
47 lines
785 B
Bash
#!/bin/bash
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# shellcheck disable=SC2155
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if ! type "include" > /dev/null 2>&1; then
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include() {
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. "$(cd "$(dirname "$1")" && pwd)/${2}";
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};
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fi
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include "${BASH_SOURCE[0]}" ../pragma_once.bash
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if ! pragma_once ${BASH_SOURCE[0]}; then return 0; fi
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include "${BASH_SOURCE[0]}" ./global_rely/export.bash
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# shellcheck source=./global_rely/export.bash
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square() {
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echo $(($1 * $1))
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}
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cube() {
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echo $(($1 * $1 * $1))
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}
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add() {
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echo $(($1 + $2))
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}
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map() {
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local fn=$1
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while read value; do
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$fn $value
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done
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}
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reduce() {
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local fn=$1
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local result=${2:-0} # 初始值
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while read value; do
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result=$($fn $result $value)
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done
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echo $result
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}
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#seq 1 10 | map square | reduce add # 平方和：385
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#seq 1 10 | map cube | reduce add # 立方和：3025
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return 0 |