has method

bool has(
  1. String name, [
  2. String value
])

The has() method of the URLSearchParams interface returns a boolean value that indicates whether the specified parameter is in the search parameters.

A parameter name and optional value are used to match parameters. If only a parameter name is specified, then the method will return true if any parameters in the query string match the name, and false otherwise. If both a parameter name and value are specified, then the method will return true if a parameter matches both the name and value.

Implementation

external bool has(
  String name, [
  String value,
]);