Can you please explain this code?

Question

Cz, these type of syntax isn't in tutorials.
Specially line number 4 in is tab.
https://code.sololearn.com/Whzgl4I41okE/?ref=app

Answer 1

👑🌟Avinash🌟👑 hello,
To add at Hrvoje answer ,
Line 4,9&13 are arrow functions which are assigned to constants,and then you call that constant as a function: calcFps();
For better understanding you could check "arrow functions " ( and maybe also "anonymous functions".)

Answer 2

1: indicates strict mode
3: defines variables
4: defines constant and creates lambda
5: defines variable and assignes the value (time difference from last execution of line 6)
6: assignes the value to the variable (actual time)
7: prints out string and product of the formula
9: defines constant and creates lambda
10: calls lambda (as the value of a constant)
11: calls animation mode in browser
13: defines constant and creates lambda
14: calls constant value (lambda)
16: starts lambda (cinstant value) on the page load