文件操作 - map-emplace.js
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文件: /usr/share/nodejs/core-js/internals/map-emplace.js
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'use strict'; var call = require('../internals/function-call'); var aCallable = require('../internals/a-callable'); var anObject = require('../internals/an-object'); // `Map.prototype.emplace` method // https://github.com/thumbsupep/proposal-upsert module.exports = function emplace(key, handler) { var map = anObject(this); var get = aCallable(map.get); var has = aCallable(map.has); var set = aCallable(map.set); var value, inserted; if (call(has, map, key)) { value = call(get, map, key); if ('update' in handler) { value = handler.update(value, key, map); call(set, map, key, value); } return value; } inserted = handler.insert(key, map); call(set, map, key, inserted); return inserted; };
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