Javascript Performance related Points.

In this video, we can learn
1. How to measure Performance of Javascript code.
1. console.time()
//block of code
console.timeEnd() // Time taken to execute the code in milliseconds

2. let startTime = performance.now() //block of code
let endTime = performance.now()
endTime-startTime //Time taken to execute the code in milliseconds

3. jsperf or jsbench

2. Line Level Profiling
3. Avoid using array.length in for loops
4. Use event.target.valueAsNumber instead of event.target.value
for input type number.

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