What is the purpose of console.time() and console.timeEnd() in this code?
function processData(data) {
console.time('processData');
// Complex data processing
const result = data.map(item => transform(item))
.filter(item => validate(item))
.reduce((acc, item) => combine(acc, item), initial);
console.timeEnd('processData');
return result;
}
console.time() and console.timeEnd() are used for performance measurement: 1) They create a high-precision timer to measure code execution time, 2) console.time('label') starts a timer with a unique label, 3) console.timeEnd('label') stops the timer with the matching label and logs the elapsed time, 4) This provides precise millisecond timing for performance analysis, 5) Multiple timers can run simultaneously with different labels, 6) This technique is valuable for identifying performance bottlenecks, 7) It's more convenient than manually calculating time differences with Date objects, 8) In this example, it measures how long the data transformation operations take, helping optimize the processing pipeline if needed.