AddValueToKeyedGroup.jsā¢1.3 kB
'use strict';
var $TypeError = require('es-errors/type');
var SameValue = require('./SameValue');
var IsArray = require('../helpers/IsArray');
var every = require('../helpers/every');
var forEach = require('../helpers/forEach');
var hasOwn = require('hasown');
var isKeyedGroup = function (group) {
return hasOwn(group, '[[Key]]')
&& hasOwn(group, '[[Elements]]')
&& IsArray(group['[[Elements]]']);
};
// https://262.ecma-international.org/15.0/#sec-add-value-to-keyed-group
module.exports = function AddValueToKeyedGroup(groups, key, value) {
if (!IsArray(groups) || (groups.length > 0 && !every(groups, isKeyedGroup))) {
throw new $TypeError('Assertion failed: `groups` must be a List of Records with [[Key]] and [[Elements]]');
}
var matched = 0;
forEach(groups, function (g) { // step 1
if (SameValue(g['[[Key]]'], key)) { // step 2
matched += 1;
if (matched > 1) {
throw new $TypeError('Assertion failed: Exactly one element of groups meets this criterion'); // step 2.a
}
var arr = g['[[Elements]]'];
arr[arr.length] = value; // step 2.b
}
});
if (matched === 0) {
var group = { '[[Key]]': key, '[[Elements]]': [value] }; // step 2
// eslint-disable-next-line no-param-reassign
groups[groups.length] = group; // step 3
}
};