web.url-search-params.has.js

'use strict';
var getBuiltIn = require('../internals/get-built-in');
var defineBuiltIn = require('../internals/define-built-in');
var uncurryThis = require('../internals/function-uncurry-this');
var toString = require('../internals/to-string');
var validateArgumentsLength = require('../internals/validate-arguments-length');

var URLSearchParams = getBuiltIn('URLSearchParams');
var URLSearchParamsPrototype = URLSearchParams.prototype;
var getAll = uncurryThis(URLSearchParamsPrototype.getAll);
var $has = uncurryThis(URLSearchParamsPrototype.has);
var params = new URLSearchParams('a=1');

if (params.has('a', 2)) {
  defineBuiltIn(URLSearchParamsPrototype, 'has', function has(name /* , value */) {
    var length = arguments.length;
    var $value = length < 2 ? undefined : arguments[1];
    if (length && $value === undefined) return $has(this, name);
    var values = getAll(this, name); // also validates `this`
    validateArgumentsLength(length, 1);
    var value = toString($value);
    var index = 0;
    while (index < values.length) {
      if (values[index++] === value) return true;
    } return false;
  }, { enumerable: true, unsafe: true });
}