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@axefrog
Last active January 17, 2017 04:17
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function copyArray<T>(values: T[]): T[] {
switch(value.length) {
case 0: return [];
case 1: return [value[0]];
case 2: return [value[0], value[1]];
case 3: return [value[0], value[1], value[2]];
case 4: return [value[0], value[1], value[2], value[3]];
case 5: return [value[0], value[1], value[2], value[3], value[4]];
case 6: return [value[0], value[1], value[2], value[3], value[4], value[5]];
case 7: return [value[0], value[1], value[2], value[3], value[4], value[5], value[6]];
default:
var arr = new Array(value.length);
for(var i = 0; i < value.length; i++) {
arr[i] = value[i];
}
return arr;
}
}
var now = require('performance-now');
var lodash = require('lodash');
function run(fn, values, n) {
var value;
for(var start = now(), result = 0, i = 0; i < n; i++) {
value = values[i%5];
result = fn(value)[i%value.length];
}
var t = now() - start;
return n/t;
}
function compare(n, init, fns) {
var values = [];
for(var i = 0; i < 5; i++) {
values.push(init());
}
run(fns[fns.length-1], values, n);
console.log('RUN A:');
for(var i = 0; i < fns.length; i++) {
var t = run(fns[i], values, n);
console.log(`#${i+1}: ${t} ops/ms, ${t*1000} ops/sec`);
}
console.log('RUN B:');
for(var i = 0; i < fns.length; i++) {
var t = run(fns[i], values, n);
console.log(`#${i+1}: ${t} ops/ms, ${t*1000} ops/sec`);
}
console.log('RUN C:');
for(var i = fns.length - 1; i >= 0; i--) {
var t = run(fns[i], values, n);
console.log(`#${i+1}: ${t} ops/ms, ${t*1000} ops/sec`);
}
console.log('RUN D:');
for(var i = fns.length - 1; i >= 0; i--) {
var t = run(fns[i], values, n);
console.log(`#${i+1}: ${t} ops/ms, ${t*1000} ops/sec`);
}
}
function init(n) {
var arr = new Array(n);
for(var i = 0, arr = []; i < n; arr[i] = {x:Math.random()}, i++);
return arr;
}
var functions = [
function(value) {
switch(value.length) {
case 0: return [];
case 1: return [value[0]];
case 2: return [value[0], value[1]];
case 3: return [value[0], value[1], value[2]];
case 4: return [value[0], value[1], value[2], value[3]];
case 5: return [value[0], value[1], value[2], value[3], value[4]];
case 6: return [value[0], value[1], value[2], value[3], value[4], value[5]];
case 7: return [value[0], value[1], value[2], value[3], value[4], value[5], value[6]];
default:
var arr = new Array(value.length);
for(var i = 0; i < value.length; i++) {
arr[i] = value[i];
}
return arr;
}
},
function(value) {
if(value.length > 7) {
var arr = new Array(value.length);
for(var i = 0; i < value.length; i++) {
arr[i] = value[i];
}
return arr;
}
switch(value.length) {
case 0: return [];
case 1: return [value[0]];
case 2: return [value[0], value[1]];
case 3: return [value[0], value[1], value[2]];
case 4: return [value[0], value[1], value[2], value[3]];
case 5: return [value[0], value[1], value[2], value[3], value[4]];
case 6: return [value[0], value[1], value[2], value[3], value[4], value[5]];
case 7: return [value[0], value[1], value[2], value[3], value[4], value[5], value[6]];
default: return arr.slice();
}
},
function(value) {
var arr = new Array(value.length);
for(var i = 0; i < value.length; i++) {
arr[i] = value[i];
}
return arr;
},
function(value) {
var arr = [];
for(var i = 0; i < value.length; i++) {
arr.push(value[i]);
}
return arr;
},
function(value) {
return value.slice();
},
function(value) {
return lodash.clone(value);
}
];
(function() {
console.log('--- #1 ---')
compare(2000000, () => init(1), functions);
console.log('--- #3 ---')
compare(2000000, () => init(3), functions);
console.log('--- #16 ---')
compare(1000000, () => init(16), functions);
console.log('--- #32 ---')
compare(500000, () => init(32), functions);
console.log('--- #1000 ---')
compare(100000, () => init(1000), functions);
console.log('--- #10000 ---')
compare(50000, () => init(10000), functions);
console.log('--- #100000 ---')
compare(5000, () => init(100000), functions);
console.log('--- #1048576 ---')
compare(200, () => init(1048576), functions);
})();
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