48 lines
1.3 KiB
JavaScript
48 lines
1.3 KiB
JavaScript
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'use strict';
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var $TypeError = require('es-errors/type');
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var callBound = require('call-bind/callBound');
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var $push = callBound('Array.prototype.push');
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var SameValue = require('./SameValue');
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var IsArray = require('../helpers/IsArray');
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var every = require('../helpers/every');
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var forEach = require('../helpers/forEach');
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var hasOwn = require('hasown');
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var isKeyedGroup = function (group) {
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return hasOwn(group, '[[Key]]')
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&& hasOwn(group, '[[Elements]]')
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&& IsArray(group['[[Elements]]']);
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};
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// https://tc39.es/ecma262/#sec-add-value-to-keyed-group
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module.exports = function AddValueToKeyedGroup(groups, key, value) {
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if (!IsArray(groups) || (groups.length > 0 && !every(groups, isKeyedGroup))) {
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throw new $TypeError('Assertion failed: `groups` must be a List of Records with [[Key]] and [[Elements]]');
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}
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var matched = 0;
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forEach(groups, function (g) { // step 1
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if (SameValue(g['[[Key]]'], key)) { // step 2
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matched += 1;
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if (matched > 1) {
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throw new $TypeError('Assertion failed: Exactly one element of groups meets this criterion'); // step 2.a
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}
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$push(g['[[Elements]]'], value); // step 2.b
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}
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});
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if (matched === 0) {
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var group = { '[[Key]]': key, '[[Elements]]': [value] }; // step 2
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$push(groups, group); // step 3
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}
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};
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