Last change
on this file since 188ee53 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
initial commit
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File size:
721 bytes
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[6a3a178] | 1 | 'use strict';
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| 2 | var anObject = require('../internals/an-object');
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| 3 |
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| 4 | // `Map.prototype.upsert` method
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| 5 | // https://github.com/thumbsupep/proposal-upsert
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| 6 | module.exports = function upsert(key, updateFn /* , insertFn */) {
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| 7 | var map = anObject(this);
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| 8 | var insertFn = arguments.length > 2 ? arguments[2] : undefined;
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| 9 | var value;
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| 10 | if (typeof updateFn != 'function' && typeof insertFn != 'function') {
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| 11 | throw TypeError('At least one callback required');
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| 12 | }
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| 13 | if (map.has(key)) {
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| 14 | value = map.get(key);
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| 15 | if (typeof updateFn == 'function') {
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| 16 | value = updateFn(value);
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| 17 | map.set(key, value);
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| 18 | }
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| 19 | } else if (typeof insertFn == 'function') {
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| 20 | value = insertFn();
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| 21 | map.set(key, value);
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| 22 | } return value;
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| 23 | };
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