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bench-define-property.js
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bench-define-property.js
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// Copyright 2013-2018 Benedikt Meurer
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// <https://www.apache.org/licenses/LICENSE-2.0>
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
let N = 100000; // number of objects
let M = 20; // number of properties
let properties = [];
for (let i = 0; i < M; i++) {
properties.push(`property${i}`);
}
let descriptorA = {
configurable: false,
enumerable: true
};
let descriptorB = {
enumerable: false
};
function objectDef(obj, desc) {
return function(prop) {
try {
Object.defineProperty(obj, prop, desc);
return true;
} catch (e) {
return false;
}
}
}
function reflectDef(obj, desc) {
return function(prop) {
return Reflect.defineProperty(obj, prop, desc);
}
}
function run(fn) {
let start = performance.now();
let ok = 0;
for (let i = 0; i < N; i++) {
let obj = {};
ok += properties.filter(fn(obj, descriptorA)).length;
//ok += properties.filter(fn(obj, descriptorB)).length;
}
let end = performance.now();
console.log(`${fn.name}: ${end - start} ms.`);
}
run(reflectDef);
run(objectDef);