Table of Contents

Bash Arrays

陣列可以存放多個值，只支援一維陣列，並不支援多維陣列，Array Bash 初始化時不需要定義陣列大小，本篇增加了範例，並透過單元測試來驗證產出結果。

檔案目錄

./
   +- arrays
       +- arrays_test.sh

單元測試

Bash Arrays 提供新增、取得、修改、刪除等操作陣列中的元素。

testAdd

建立一個 Array，增加三個元素。

testAdd () {
    local expectedLength=3
    local array=("Durian" "Guava" "Pitaya")
    echo ${array[@]}
    assertEquals "length" $expectedLength ${#array[@]}
}

Durian Guava Pitaya

testAddByIndex

建立一個 Array，內有三個元素，指定位置增加第四個元素。

testAddByIndex () {
    local expectedLength=4
    local array=("Durian" "Guava" "Pitaya")
    #array+=("Grape")
    array[3]="Grape"
    echo ${array[@]}
    assertEquals "length" $expectedLength ${#array[@]}
}

Durian Guava Pitaya Grape

testGet

建立一個 Array，內有三個元素，取得指定位置元素。

testGet () {
    local expected="Guava"
    local array=("Durian" "Guava" "Pitaya")
    echo ${array[1]}
    assertEquals "get" $expected ${array[1]}
}

Guava

testDelete

建立一個 Array，內有三個元素，刪除指定位置元素。

testDelete () {
    local expectedLength=2
    local array=("Durian" "Guava" "Pitaya")
    unset array[0]
    echo ${array[@]}
    assertEquals "length" $expectedLength ${#array[@]}
}

Guava Pitaya

testDeleteAll

建立一個 Array，內有三個元素，刪除所有元素。

testDeleteAll () {
    local expectedLength=0
    local array=("Durian" "Guava" "Pitaya")
    unset array
    echo ${!array[@]}
    assertEquals "length" $expectedLength ${#array[@]}
}

testLength

建立一個 Array，內有三個元素，取得陣列長度。

testLength () {
    local expectedLength=3
    local array=("Durian" "Guava" "Pitaya")
    echo ${#array[@]}
    assertEquals "length" $expectedLength ${#array[@]}
}

testLoop

建立一個 Array，內有三個元素，迴圈取得元素。

testLoop () {
    local array=("Durian" "Guava" "Pitaya")
    for i in "${array[@]}"
    do
        echo $i
    done
}

Durian
Guava
Pitaya

testSet

建立一個 Array，內有三個元素，修改指定位置元素。

testSet () {
    local expected="Grape"
    local array=("Durian" "Guava" "Pitaya")
    echo ${array[@]}
    array[0]="Grape"
    echo ${array[@]}
    assertEquals "get" $expected ${array[0]}
}

Durian Guava Pitaya
Grape Guava Pitaya

testSlice

建立一個 Array，內有三個元素，取得指定索引元素。

testSlice () {
    local expectedLength=2
    local array=("Durian" "Guava" "Pitaya")
    local sliceArray=("${array[@]:1:2}")
    echo ${sliceArray[@]}
    assertEquals "length" $expectedLength ${#sliceArray[@]}
}

Guava Pitaya

arrays_test.sh

Array in Bash 新增單元測試，驗證是否符合預期。

#!/bin/bash

testAdd () {
    local expectedLength=3
    local array=("Durian" "Guava" "Pitaya")
    echo ${array[@]}
    assertEquals "length" $expectedLength ${#array[@]}
}

testAddByIndex () {
    local expectedLength=4
    local array=("Durian" "Guava" "Pitaya")
    #array+=("Grape")
    array[3]="Grape"
    echo ${array[@]}
    assertEquals "length" $expectedLength ${#array[@]}
}

testGet () {
    local expected="Guava"
    local array=("Durian" "Guava" "Pitaya")
    echo ${array[1]}
    assertEquals "get" $expected ${array[1]}
}

testDelete () {
    local expectedLength=2
    local array=("Durian" "Guava" "Pitaya")
    unset array[0]
    echo ${array[@]}
    assertEquals "length" $expectedLength ${#array[@]}
}

testDeleteAll () {
    local expectedLength=0
    local array=("Durian" "Guava" "Pitaya")
    unset array
    echo ${!array[@]}
    assertEquals "length" $expectedLength ${#array[@]}
}

testLength () {
    local expectedLength=3
    local array=("Durian" "Guava" "Pitaya")
    echo ${#array[@]}
    assertEquals "length" $expectedLength ${#array[@]}
}

testLoop () {
    local array=("Durian" "Guava" "Pitaya")
    for i in "${array[@]}"
    do
        echo $i
    done
}

testSet () {
    local expected="Grape"
    local array=("Durian" "Guava" "Pitaya")
    echo ${array[@]}
    array[0]="Grape"
    echo ${array[@]}
    assertEquals "get" $expected ${array[0]}
}

testSlice () {
    local expectedLength=2
    local array=("Durian" "Guava" "Pitaya")
    local sliceArray=("${array[@]:1:2}")
    echo ${sliceArray[@]}
    assertEquals "length" $expectedLength ${#sliceArray[@]}
}


# Load shunit2
. shunit2