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@ryanjduffy
Last active August 29, 2015 14:27
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Console jsperf

Usage Example

// Setup code before all tests are ran
jsperf.before(function () {
   testStr = '-1/2';
});

// Teardown code after all tests are ran
jsperf.after(function () {
   testStr = null;
});

// Setup code before each test (not each iteration)
// jsperf.beforeEach(function () {});

// Teardown code after each test (not each iteration)
// jsperf.beforeEach(function () {});

// A test named 'using split'
jsperf.test('using split', function () {
   testStr.split('-')[1];
});

// Another test
jsperf.test('using replace', function () {
   testStr.replace('-', '');
});

// An unnamed test
jsperf.test(function () {
   if (testStr[0] == '-') testStr.substring(1)
});

// Run for 3 seconds per test. Defaults to 10 seconds.
jsperf.run(3000);
// copy/paste into console or add as a snippet in the dev tools
var jsperf = (function () {
var before, beforeEach, after, afterEach, tests;
var perfNow = (function () {
var perf = window.performance || {};
perf.now = perf.now || perf.mozNow || perf.msNow || perf.oNow || perf.webkitNow || Date.now || function () {
return new Date().getTime();
};
return function () {
return perf.now();
};
})();
function out (results) {
if (console.table) {
console.table(results);
} else {
results.forEach(function (r, i) {
console.log(i + '\t' + r.iterations);
});
}
};
function init () {
before = beforeEach = after = afterEach = null;
tests = [];
}
function setBefore (fn) { before = fn; }
function setBeforeEach (fn) { beforeEach = fn; }
function setAfter (fn) { after = fn; }
function setAfterEach (fn) { afterEach = fn; }
function addTest (name, fn) {
if (!fn) {
fn = name;
name = 'Test #' + (tests.length + 1);
}
tests.push({
name: name,
fn: fn
});
}
function metrics (results) {
var max = Math.max.apply(Math, results.map(function (r) { return r.Iterations; }));
results.forEach(function (r) {
var diff = Math.round(((max - r.Iterations) / max) * 100, 2);
r.Compare = diff === 0 ? 'Fastest' : diff + '% Slower';
});
}
function run (duration) {
var start, startEach, endEach, test, result,
i = 0,
l = tests.length,
results = [],
duration = duration || 10*1000;
if (!l) {
console.error('No tests provided');
return;
}
start = perfNow();
if (before) before();
while (i++ < l) {
test = tests.shift();
result = {
'Test Name': test.name,
Iterations: 0,
Compare: '',
Duration: 0
};
console.log('Running', test.name);
if (beforeEach) beforeEach();
startEach = perfNow();
do {
test.fn();
endEach = perfNow();
result.Iterations++;
} while (startEach + duration > endEach)
if (afterEach) afterEach();
result.Duration = endEach - startEach;
results.push(result);
}
if (after) after();
metrics(results);
out(results);
init();
}
init();
return {
before: setBefore,
beforeEach: setBeforeEach,
after: setAfter,
afterEach: setAfterEach,
test: addTest,
run: run
};
})();
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