JavaScript-vs-PowerShell.htm

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<title>JavaScript vs. PowerShell</title>
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<table>
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<th>JavaScript
<th>PowerShell

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<pre><code class="javascript">
// This is a single line comment.
/* This is a 
comment block. 

JS is case-sensitive.
*/
</code></pre>
</td>
<td>
<pre><code class="powershell">
# This is a single line comment.
<# This is a 
comment block. 

PowerShell is not case-sensitive.
#>
</code></pre>
</td>

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<td>
<pre><code class="javascript">
// JS variables can start with a letter, $, _
var v = 1;
const c = 2;
let b = 3;
    
stringDouble = "double quotes";
stringSingle = 'single quotes';
escape = "\"";
template = `a = ${a}`; // ES6 [?]

</code></pre>
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<pre><code class="powershell">
# PowerShell variables start with $
$v = 1
Set-Variable c -option constant -value 2
# n/a [use script:, global:, etc ?]
    
$stringDouble = "double quotes"
$stringSingle = 'single quotes' # no string interpolation
$escape = "`""
$template1 = "a = $a" # $a is simple.
$template2 = "a.b = $($a.b)" # $a.b is not simple.
</code></pre>
</td>

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<td>
<pre><code class="javascript">
arr = [1, 2];
arr = [];
arr.push(3);
b = arr[0];
// no support for negative indexes
arr.slice(0, 3); // end is not included
arr.length;
</code></pre>
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<td>
<pre><code class="powershell">
$arr = 1, 2
$arr = @()
$arr += 3
$b = $arr[0]
# negative indexes
$arr[0..2] # end is included
$arr.length # or $arr.count
</code></pre>
</td>

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<pre><code class="javascript">
hash = {name1: "value", n2: 2};
hash = {};
hash.n3 = 3;

longhash = {
    name1: "value",
    n2: 2
};
user = {firstName: 'Gabriel', lastName: 'Sroka'};
</code></pre>
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<td>
<pre><code class="powershell">
$hash = @{name1 = "value"; n2 = 2}
$hash = @{}
$hash.n3 = 3

$longhash = @{ # longhash doesn't use semicolons.
    name1 = "value"
    n2 = 2
}
$user = {firstName = 'Gabriel'; lastName = 'Sroka'}
</code></pre>
</td>

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<td>
<pre><code class="javascript">
// function name is usually a verb.
function add(a1, a2) {
    return a1 + a2;
}

 
v = add(a1, a2);
</code></pre>
</td>
<td>
<pre><code class="powershell">
# function name is Verb-Noun. Must be declared before it's called.
function Add-Numbers($a1, $a2) {
    $a1 + $a2
    # return is optional.
}
 
$v = Add-Numbers $a1 $a2
</code></pre>
</td>

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<td>
<pre><code class="javascript">
if (a == b) /* ... */ // Braces are optional but recommended.
if (a < b)
</code></pre>
</td>
<td>
<pre><code class="powershell">
if ($a -eq $b) { <# ... #> } # Braces are required.
if ($a -lt $b) { <# ... #> }
</code></pre>
</td>

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<td>
<pre><code class="javascript">
b = true;
 
if (a == b) {
    //
} else if (b < c) {
    // 
} else {
    //
}
 
while ( ) { }
do { } while ( )
for (i = 0; i < MAX; i++) { }
for (item of collection) // ES6 [?]
</code></pre>
</td>
<td>
<pre><code class="powershell">
$b = $true;
 
if ($a -eq $b) {
    #
} elseif ($b -lt $c) {
    # 
} else {
    #
}



for ($i = 0; $i -lt $MAX; $i++) { }
foreach ($item in $collection)
</code></pre>
</td>



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<td>
<pre><code class="javascript">

</code></pre>
</td>
<td>
<pre><code class="powershell">

</code></pre>
</td>

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