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$jsonArrayPop

$jsonArrayPop removes the last element from a JSON array and returns it.

Syntax

$jsonArrayPop[Key;...]

• Key: one or more keys forming the path to the array.

What happens

1. $jsonParse loads the JSON object.
2. $jsonArrayPop removes the last element from the array and returns its value.
3. The array is one element shorter after this call.

Example 1: Pop the last element

$nomention
$jsonParse[{"music":["Paranoid","Ping! 2","Tokyo"\]}]
Removed: $jsonArrayPop[music]
Remaining: $jsonJoinArray[music;, ]

What happens:

1. $jsonParse loads the object.
2. $jsonArrayPop[music] removes Tokyo from the end and returns it.
3. $jsonJoinArray shows what is left.

Output:

Removed: Tokyo
Remaining: Paranoid, Ping! 2

Example 2: Pop until empty

$nomention
$jsonParse[{"stack":["first","second","third"\]}]
> $jsonArrayPop[stack]
> $jsonArrayPop[stack]
Remaining: $jsonJoinArray[stack;, ]

What happens:

1. $jsonParse loads the object.
2. The first $jsonArrayPop removes and returns third.
3. The second removes and returns second.
4. $jsonJoinArray shows what is left.

Output:

> third
> second
Remaining: first

Common uses

• Queue systems: process and remove the most recently added item
• Undo functionality: pop the last item from a history list
• Reducing a list: remove trailing entries one at a time

See also

• $jsonArrayShift: to remove the first element instead
• $jsonArrayAppend: to add elements to the end
• $jsonJoinArray: to display the remaining array after popping