I'm having trouble understanding how this code snippet works. Can someone please provide a demonstration? Thanks in advance.... It seems that the code is subtracting 'start' from the current date with new Date, resulting in 0 which is less than 500. How does the while loop operate under these conditions?
let start = new Date().getTime(); while(new Date().getTime() - start < 5000);This snippet of code is designed to wait for 5 seconds before proceeding with the next set of commands.
The method new Date().getTime() retrieves the current time in milliseconds, and the while loop will continue indefinitely until 5 seconds have elapsed since the start time.
let startTime = new Date().getTime();
while (new Date().getTime() - startTime < 5000);
// The subsequent commands will be executed after the 5-second delay.
...
This code snippet creates a new Date object with the current date and time:
const startDate = new Date();
It then gets the number of milliseconds since January 1, 1970:
const startTime = startDate.getTime();
Therefore, new Date().getTime() will return a value like this: 1605598723149.
The while loop calculates the elapsed time in milliseconds by subtracting the start time (startTime) from the current time.
let timeDifference = new Date().getTime() - startTime;
Thus, timeDifference holds the number of milliseconds that have passed since the start until now.
The while loop continues to run until the time difference exceeds 5000 milliseconds (equivalent to 5 seconds).
while(new Date().getTime() - start < 5000);
(A variable cannot be used because the Date object is static and remains unchanged after declaration.)
In this updated version, I replaced let with const as the start time should not change.
I also substituted new Date().getTime() with Date.now() for brevity, efficiency, and clarity.
const start = Date.now();
while(Date.now() - start < 5000);
To pause your code execution for a specified number of milliseconds, you can utilize the setTimeout() method.
setTimeout(function(){ alert("Hello"); }, 5000);
For more information on using the setTimeout function, you may refer to this resource.
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