boilerplate.js/Boilerplate/src/js/helpers/measure.js

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/* How To Use

    measure('start', 'Calculate Stuff');
    or
    measure.start('Calculate Stuff');

    var counter = 0;

    data.forEach(item => {
        // Logic
        counter++;
    });

    measure('stop', 'Calculate Stuff');
    or
    measure.stop('Calculate Stuff');


    //=> 'Calculate Stuff: 4929.200000013225 ms'

*/

function measure(status, name, ms) {

    try {
        
        if (status === 'start') {
            measure[name] = {};
            measure[name].start = performance.now();
        }
    
        if (status === 'stop') {
            measure[name].stop = performance.now();
            const time = measure[name].stop - measure[name].start + ' ms';
            if (ms) {
                return time;
            } else {
                log('%c' + name + ':', 'color: blue;', time);
            }
        }

    } catch (error) {

        log('Measure Error');

    }
    
}

measure.start = (name, ms = false) => measure('start', name, ms);
measure.stop = (name, ms = false) => measure('stop', name, ms);