$$filter

Filter input array to all the elements that satisfy the predicate transformer

Usage

{ 
  "$$filter": /* Array of elements */,
  "by": /* Transformer(##current,##index) */
}

"$$filter(<by>):{input}"

info

predicate by should resolve to a boolean value, it uses the truthy logic

Returns

array - Same items type as input

Arguments

Argument	Type	Values	Required / Default Value	Description
Primary	array		Yes	Array of elements
by	Transformer(##current,##index)		Yes	A predicate transformer for an element ##current - Current element ##index - Current index

Examples

Input

Definition

Output

[
  "a",
  true,
  "false",
  0,
  1,
  [],
  [
    0
  ]
]

{
  "$$filter": "$",
  "by": "##current"
}

[
  "a",
  true,
  "false",
  1,
  [
    0
  ]
]

Test

[
  "a",
  true,
  "false",
  0,
  1,
  [],
  [
    0
  ]
]

{
  "$$filter": "$",
  "by": "$$boolean:##current"
}

[
  true,
  1,
  [
    0
  ]
]

Test

[
  {
    "name": "alice"
  },
  {
    "name": "ann"
  },
  {
    "name": "bob"
  }
]

{
  "$$filter": "$",
  "by": "$$test(^a):##current.name"
}

[
  {
    "name": "alice"
  },
  {
    "name": "ann"
  }
]

Test

[
  "a",
  true,
  "false",
  0,
  1,
  [],
  [
    0
  ]
]

"$$filter(##current):$"

[
  "a",
  true,
  "false",
  1,
  [
    0
  ]
]

Test