$$findindex

Find the index of the first element in a specified array that satisfy the predicate transformer.

If none of the elements satisfy the predicate the result will be -1.

Usage

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

"$$findindex([by]):{input}"

note

Concrete values in the usage example are default values.

info

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

Returns

number

Arguments

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

Examples

Input

Definition

Output

[
  0,
  [],
  "a"
]

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

2

Test

[
  "a",
  "1",
  "true"
]

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

2

Test

[
  "a",
  "1",
  "false"
]

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

-1

Test

[
  0,
  [],
  "a"
]

"$$findindex(##current):$"

2

Test

[
  0,
  [],
  "false"
]

"$$findindex('$$boolean:##current'):$"

-1

Test