Bmark is a micro library for time measurement in JS applications. It uses some ES2015 features (such as constants and classes) so you can use this library in node.js from version 4.0.0 and in browsers that supports ES2015. For usage in other browsers and platforms you may transpile this module via Babel.

First install module via npm:

npm install --save-dev bmark

Include bmark module to your project. For node.js and other systems that uses Commonjs modules:

const Bmark = require('bmark');

Then you can create one or more bmark instances to measure the time in different parts of your program. Example:

const bmark = new Bmark();
bmark.start();

// ...

console.info('Elapsed time in ms: ' + bmark.stop().getElapsed());

Go to: Bmark.start, Bmark.stop, Bmark.reset, Bmark.getElapsed.

Bmark class constructor accepts input object. You can pass next options:

• options.throwErrors<Boolean>: if set to false, Bmark instance will not throw any errors. Default: true.

All methods except bmark.getElapsed() returns current instance so you can chain method calls if you want. For example:

const bmark = new Bmark();
bmark.start();

// ...

bmark.stop().reset().start();

// ...

console.log(bmark.stop().getElapsed());

Starts time measurement from current time. You can call this method not only after creating new instance of bmark but in any time you want when current instance is not started.

const bmark = new Bmark();
bmark.start(); // OK

// ...

bmark.stop();
bmark.start(); // OK

// ...

bmark.start(); // Error: Can't start current instance: it is already started

Stops time incrementing from current moment. It doesn't reset elapsed time so you can use this method as pause.

const bmark = new Bmark();
bmark.start();

// ...

bmark.stop(); // OK

// ...

bmark.stop(); // Error: Can't stop current instance: it is already stopped

Sets 0 as current elapsed time. You can call this method when bmark instance is not working.

const bmark = new Bmark();
bmark.start();

// ...

bmark.stop();
bmark.reset(); // OK

bmark.start();

// ...

bmark.reset(); // Error: Can't reset current instance: you must stop it before

Returns elapsed time from first start to last stop (if no resets were called). Returns time in ms by default or as object of format = 'object', in this case the returned object will contain hours, minutes, seconds and ms fields.

const bmark = new Bmark();
bmark.start();

// ...

bmark.stop();

console.info('Result in ms: ' + bmark.getElapsed()); 
// Result in ms: 1900

console.info('Result as object: ' + JSON.stringify(bmark.getElapsed('object'))); 
// Result as object: {"hours":0,"minutes":0,"seconds":1,"ms":900}