| 1 | import { toArray } from './toarray';
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| 2 | export function reduceRight(source, accumulator, ...seed) {
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| 3 | const array = toArray(source);
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| 4 | const hasSeed = seed.length === 1;
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| 5 | let hasValue = false;
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| 6 | let acc = seed[0];
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| 7 | for (let offset = array.length - 1; offset >= 0; offset--) {
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| 8 | const item = array[offset];
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| 9 | if (hasValue || (hasValue = hasSeed)) {
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| 10 | acc = accumulator(acc, item, offset);
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| 11 | }
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| 12 | else {
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| 13 | acc = item;
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| 14 | hasValue = true;
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| 15 | }
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| 16 | }
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| 17 | if (!(hasSeed || hasValue)) {
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| 18 | throw new Error('Sequence contains no elements');
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| 19 | }
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| 20 | return acc;
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| 21 | }
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| 22 |
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| 23 |
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