$$switch

Switch-case expression. Value is compared to each of the keys in cases and a matching key will result with its value, otherwise default value or null will be returned.

Usage

{ 
  "$$switch": /* Value to test */,
  "cases": /* object */,
  "default": null /* any */
}

"$$switch(<cases>,[default]):{input}"

note

Concrete values in the usage example are default values.

Returns

Same as default value or one of the cases values

Arguments

Argument	Type	Values	Required / Default Value	Description
Primary	any		Yes	Value to test
cases	object		Yes	A map of cases (string to value)
default	any		null	Fallback value in case no match to any key in cases

Examples

Input

Definition

Output

"B"

{
  "$$switch": "$",
  "cases": {
    "a": 1,
    "B": 2,
    "c": 3
  }
}

2

Test

"D"

{
  "$$switch": "$",
  "cases": {
    "a": 1,
    "B": 2,
    "c": 3
  }
}

null

Test

"D"

{
  "$$switch": "$",
  "cases": {
    "a": 1,
    "B": 2,
    "c": 3
  },
  "default": 4
}

4

Test

[
  "B",
  {
    "a": 1,
    "B": 2,
    "c": 3
  }
]

{
  "$$switch": "$[0]",
  "cases": "$[1]"
}

2

Test

{
  "a": 1,
  "B": 2,
  "c": 3
}

"$$switch($,'$$decimal:4'):B"

2

Test

{
  "a": 1,
  "B": 2,
  "c": 3
}

"$$switch($,'$$decimal:4'):C"

4

Test