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`Token.firstWhere()`

Get the first token matching a provided predicate.

Signature

Token.firstWhere(pred: (Token => Boolean)) => Token | Null

Description

Gets the first Token document that matches a provided predicate function.

Parameters

Parameter Type Required Description

Parameter	Type	Required	Description
pred	Predicate function	Yes	Anonymous predicate function that: Accepts a `Token` document as its only argument. Supports shorthand-syntax. Returns a Boolean value. The method returns the first `Key` document for which the predicate returns true.

pred

Predicate function

Yes

Anonymous predicate function that:

Accepts a Token document as its only argument. Supports shorthand-syntax.
Returns a Boolean value.

The method returns the first Key document for which the predicate returns true.

Return value

One of:

Type Description

Type	Description
Token	First `Token` document that matches the predicate.
Null	No `Token` document matches the predicate.

Token

First Token document that matches the predicate.

Null

No Token document matches the predicate.

Examples

Token.firstWhere(.document.id == "111")

{
  id: "401670938431586381",
  coll: Token,
  ts: Time("2099-06-25T13:28:27.660Z"),
  document: Customer("111")
}

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