benchmark: add microbenchmarks for ES Map

PR-URL: #7581 Reviewed-By: James M Snell <[email protected]> Reviewed-By: Franziska Hinkelmann <[email protected]>

Author: rvagg

benchmark/es/map-bench.js

@@ -0,0 +1,96 @@
+'use strict';
+
+constcommon=require('../common.js');
+constassert=require('assert');
+
+constbench=common.createBenchmark(main,{
+method: ['object','nullProtoObject','fakeMap','map'],
+millions: [1]
+});
+
+functionrunObject(n){
+constm={};
+vari=0;
+bench.start();
+for(;i<n;i++){
+m['i'+i]=i;
+m['s'+i]=String(i);
+assert.equal(m['i'+i],m['s'+i]);
+m['i'+i]=undefined;
+m['s'+i]=undefined;
+}
+bench.end(n/1e6);
+}
+
+functionrunNullProtoObject(n){
+constm=Object.create(null);
+vari=0;
+bench.start();
+for(;i<n;i++){
+m['i'+i]=i;
+m['s'+i]=String(i);
+assert.equal(m['i'+i],m['s'+i]);
+m['i'+i]=undefined;
+m['s'+i]=undefined;
+}
+bench.end(n/1e6);
+}
+
+functionfakeMap(){
+constm={};
+return{
+get(key){returnm['$'+key];},
+set(key,val){m['$'+key]=val;},
+getsize(){returnObject.keys(m).length;},
+has(key){returnObject.prototype.hasOwnProperty.call(m,'$'+key);}
+};
+}
+
+functionrunFakeMap(n){
+constm=fakeMap();
+vari=0;
+bench.start();
+for(;i<n;i++){
+m.set('i'+i,i);
+m.set('s'+i,String(i));
+assert.equal(m.get('i'+i),m.get('s'+i));
+m.set('i'+i,undefined);
+m.set('s'+i,undefined);
+}
+bench.end(n/1e6);
+}
+
+functionrunMap(n){
+constm=newMap();
+vari=0;
+bench.start();
+for(;i<n;i++){
+m.set('i'+i,i);
+m.set('s'+i,String(i));
+assert.equal(m.get('i'+i),m.get('s'+i));
+m.set('i'+i,undefined);
+m.set('s'+i,undefined);
+}
+bench.end(n/1e6);
+}
+
+functionmain(conf){
+constn=+conf.millions*1e6;
+
+switch(conf.method){
+case'object':
+runObject(n);
+break;
+case'nullProtoObject':
+runNullProtoObject(n);
+break;
+case'fakeMap':
+runFakeMap(n);
+break;
+case'map':
+runMap(n);
+break;
+default:
+thrownewError('Unexpected method');
+}
+}