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33 lines
1.0 KiB
33 lines
1.0 KiB
1 year ago
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'use strict';
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var global = require('../internals/global');
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var call = require('../internals/function-call');
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var aCallable = require('../internals/a-callable');
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var isCallable = require('../internals/is-callable');
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var anObject = require('../internals/an-object');
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var TypeError = global.TypeError;
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// `Map.prototype.upsert` method
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// https://github.com/thumbsupep/proposal-upsert
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module.exports = function upsert(key, updateFn /* , insertFn */) {
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var map = anObject(this);
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var get = aCallable(map.get);
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var has = aCallable(map.has);
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var set = aCallable(map.set);
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var insertFn = arguments.length > 2 ? arguments[2] : undefined;
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var value;
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if (!isCallable(updateFn) && !isCallable(insertFn)) {
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throw TypeError('At least one callback required');
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}
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if (call(has, map, key)) {
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value = call(get, map, key);
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if (isCallable(updateFn)) {
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value = updateFn(value);
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call(set, map, key, value);
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}
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} else if (isCallable(insertFn)) {
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value = insertFn();
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call(set, map, key, value);
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} return value;
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};
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