82 lines
2.5 KiB
JavaScript
82 lines
2.5 KiB
JavaScript
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'use strict';
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var GetIntrinsic = require('get-intrinsic');
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var AddValueToKeyedGroup = require('./AddValueToKeyedGroup');
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var Call = require('es-abstract/2022/Call');
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var GetIterator = require('es-abstract/2022/GetIterator');
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var IsCallable = require('es-abstract/2022/IsCallable');
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var IteratorClose = require('./IteratorClose');
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var IteratorStep = require('./IteratorStep');
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var IteratorValue = require('es-abstract/2022/IteratorValue');
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var maxSafeInteger = require('es-abstract/helpers/maxSafeInteger');
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var RequireObjectCoercible = require('es-abstract/2022/RequireObjectCoercible');
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var ThrowCompletion = require('es-abstract/2022/ThrowCompletion');
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var ToPropertyKey = require('es-abstract/2022/ToPropertyKey');
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var $TypeError = GetIntrinsic('%TypeError%');
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module.exports = function GroupBy(items, callbackfn, coercion) {
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if (coercion !== 'property' && coercion !== 'zero') {
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throw new $TypeError('Assertion failed: `coercion` must be `"property"` or `"zero"`');
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}
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RequireObjectCoercible(items); // step 1
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if (!IsCallable(callbackfn)) { // step 2
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throw new $TypeError('`callbackfn` must be callable');
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}
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var groups = []; // step 3
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var iterator = GetIterator(items); // step 4
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var iteratorRecord = { // TODO: remove this once GetIterator is on ES2023+
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'[[Iterator]]': iterator,
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'[[NextMethod]]': iterator.next,
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'[[Done]]': false // eslint-disable-line sort-keys
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};
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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('Iteration count exceeds the max safe integer value')); // 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.d
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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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IteratorClose(iteratorRecord, ThrowCompletion(e)); // step 6.f
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}
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if (coercion === '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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IteratorClose(iteratorRecord, ThrowCompletion(e)); // step 6.g.ii
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}
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} else {
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if (coercion !== 'zero') {
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throw new $TypeError('Assertion failed: `coercion` should be `"zero"` here'); // step 6.h.i
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}
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if (key === 0) { // step 6.h.ii
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key = 0; // handle negative zero
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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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