Arrays and loops are often used including when working with PowerShell scripts.
In the following example, 4 array values are created, these are called again by means of the ID.
An array is created with the following command:
PS C:\> $array = "sandwich", "salad","beer","espresso") Write Host $array[0,1,2,3]
Output values with For-Loop Array:
The length of the array, or the number of stored values, is read out with $array.length. The variable ($i) serves as a counter to count when to exit the loop. A start value is assigned to the counter ($i=0).The start value should increase by 1 each time the loop passes ($i++) until the final value is reached. The final value is the length of the array ($array.length). When checking the final value, there is a condition: as long as $i is less than the number of values ($i -lt $array.length).
for ($i=0; $i -lt $array.length; $i++) Write Host $array[$i] }
The For loop: for ($i=0; $i -lt $array.length; $i++)
Start value $i=0: The variable $i starts with a value of 0
is $i smaller (-lt) $i -lt $array.length condition: the For loop is executed as long as this condition is met: as long as the variable $i is less than $array.length, so as long as $i is less than 4. The action at the loop pass: $i++ means to increase the value of the variable $i by 1, with each pass of the loop $i increases by 1: 0 .. 1 .. 2 .. 3 …
$i=0 while ($i -lt $array.length) Write Host $array[$i] $i++ }
Example with starting value $i defined before the loop ($i=0)
while ($i -lt $array.length)
Within while is the condition for the loop pass, which loop wid does not leave as long as it is fulfilled:
$i -lt $array.length … as long as $i is smaller $array.length
The variable $i is incremented by 1 within the loop: $i++
while can be used for an infinite loop as follows: with break, the infinite loop can be exited again. The following example goes through the loop until break is executed, this happens when $i is no longer less than 10:
$i=0 while ($true) $i++ write-host $i if ($i -ge 10) }
$i=0 doo Write Host $array[$i] $i++ • while ($i -lt $array.length)
foreach ($i in $array) Write Host $i }
foreach ($i in $array) call all values of the array ($array). The variable $i contains the currently read value for each pass.
-eq is equal
-ne is not the same
-gt is greater than
-ge is greater or equal
-lt is smaller than
-le is less or equa
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