78 lines
2.3 KiB
JavaScript
78 lines
2.3 KiB
JavaScript
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'use strict';
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var $TypeError = require('es-errors/type');
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var AddValueToKeyedGroup = require('./AddValueToKeyedGroup');
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var Call = require('./Call');
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var GetIterator = require('./GetIterator');
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var IsCallable = require('./IsCallable');
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var IteratorClose = require('./IteratorClose');
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var IteratorStep = require('./IteratorStep');
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var IteratorValue = require('./IteratorValue');
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var RequireObjectCoercible = require('./RequireObjectCoercible');
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var ThrowCompletion = require('./ThrowCompletion');
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var ToPropertyKey = require('./ToPropertyKey');
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var isNegativeZero = require('../helpers/isNegativeZero');
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var maxSafeInteger = require('../helpers/maxSafeInteger');
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// https://tc39.es/ecma262/#sec-groupby
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module.exports = function GroupBy(items, callbackfn, keyCoercion) {
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if (keyCoercion !== 'PROPERTY' && keyCoercion !== 'ZERO') {
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throw new $TypeError('Assertion failed: `keyCoercion` must be `"PROPERTY"` or `"ZERO"`');
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}
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RequireObjectCoercible(items); // step 1
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if (!IsCallable(callbackfn)) {
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throw new $TypeError('callbackfn must be callable'); // step 2
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}
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var groups = []; // step 3
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var iteratorRecord = GetIterator(items, 'SYNC'); // step 4
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var k = 0; // step 5
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// eslint-disable-next-line no-constant-condition
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while (true) { // step 6
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if (k >= maxSafeInteger) { // step 6.a
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var error = ThrowCompletion(new $TypeError('k must be less than 2 ** 53 - 1')); // step 6.a.i
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return IteratorClose(iteratorRecord, error); // step 6.a.ii
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}
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var next = IteratorStep(iteratorRecord); // step 6.b
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if (!next) { // step 6.c
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return groups; // step 6.c.i
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}
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var value = IteratorValue(next); // step 6.dv
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var key;
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try {
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key = Call(callbackfn, undefined, [value, k]); // step 6.e
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} catch (e) {
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return IteratorClose(iteratorRecord, ThrowCompletion(e)); // step 6.f
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}
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if (keyCoercion === 'PROPERTY') { // step 6.g
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try {
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key = ToPropertyKey(key); // step 6.g.i
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} catch (e) {
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return IteratorClose(iteratorRecord, ThrowCompletion(e)); // step 6.g.ii
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}
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} else { // step 6.h
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if (keyCoercion !== 'ZERO') {
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throw new $TypeError('keyCoercion must be ~PROPERTY~ or ~ZERO~'); // step 6.h.i
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}
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if (isNegativeZero(key)) {
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key = +0; // step 6.h.ii
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}
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}
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AddValueToKeyedGroup(groups, key, value); // step 6.i
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k += 1; // step 6.j
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}
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};
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