Run results for: Using Keys vs For Loop v2

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.89 Safari/537.36

Browser: Chrome 84

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
Simple Lookup Version	3936700.8 Ops/sec
With lookup Loop	4869159.0 Ops/sec

Tests:

Simple Lookup Version
function getLowBits(byte, numBits){ return ((byte >> numBits << numBits) ^ byte) } let actions = { 0x9: [{id:"note_on", hiByte0: 0x9, loByte0: '', type:"simple", getAction(bytes){return createAction(bytes, this)}}], 0x8: [ {id:"bank_select", hiByte0: 0x9, loByte0: '', secondary:[0x00, 0x20], type:"msblsb", getAction(bytes){return createAction2(bytes, this)}}, {id:"mod_wheel", hiByte0: 0x9, loByte0: '', secondary:[0x01, 0x21], type:"msblsb", getAction(bytes){return createAction2(bytes, this)}} ] } function createAction(bytes, action){ return {id: action.id, channel: getLowBits(bytes[0], 4), type: "", note: bytes[1], volume: bytes[2]} } function createAction2(bytes, action){ if (action.type === "msblsb"){ let i = action.secondary.indexOf(bytes[1]) if (i!==-1){ return {id: action.id, channel: getLowBits(bytes[0], 4), type: i=0?"msb":"lsb", value: bytes[2]} // its a match! dunno if high or low } else { return null // no match } } return null } let midi = [0x85, 0x21, 0x64] //let midi = [0x95, 0x21, 0x64] let hiByte = midi[0]>> 4 let matches = actions[hiByte] let result if (matches.length > 1){ for (let i = 0; i < matches.length; i++) { result = matches[i].getAction(midi); if (result){ //console.log(JSON.stringify(result)) break; } } } else { result = matches[0].getAction(midi) //console.log(JSON.stringify(result)) }
With lookup Loop
function getLowBits(byte, numBits){ return ((byte >> numBits << numBits) ^ byte) } let actions = { 0x9: [{id:"note_on", hiByte0: 0x9, loByte0: '', type:"simple", getAction(bytes){return createAction(bytes, this)}}], 0x8: [ {id:"bank_select", hiByte0: 0x9, loByte0: '', secondary:[0x00, 0x20], type:"msblsb", getAction(bytes){return createAction2(bytes, this)}}, {id:"mod_wheel", hiByte0: 0x9, loByte0: '', secondary:[0x01, 0x21], type:"msblsb", getAction(bytes){return createAction2(bytes, this)}} ] } function createAction(bytes, action){ if (action.type==="simple"){ return {id: action.id, channel: getLowBits(bytes[0], 4), type: "", note: bytes[1], volume: bytes[2]} } } function createAction2(bytes, action){ if (action.type === "msblsb"){ let i = action.secondary.indexOf(bytes[1]) if (i!==-1){ return {id: action.id, channel: getLowBits(bytes[0], 4), type: i=0?"msb":"lsb", value: bytes[2]} // its a match! dunno if high or low } else { return null // no match } } return null } //let midi = [0x85, 0x21, 0x64] let midi = [0x95, 0x21, 0x64] let hiByte = midi[0]>> 4 let matches = actions[hiByte] let result if (matches.length > 1){ for (let i = 0; i < matches.length; i++) { result = matches[i].getAction(midi); if (result){ //console.log(JSON.stringify(result)) break; } } } else { result = matches[0].getAction(midi) //console.log(JSON.stringify(result)) }

Run results for: Using Keys vs For Loop v2

Trying to optimize for speed!

Simple Lookup Version

With lookup Loop