setTimeout

For executing some methods based on some times, then we should go ahead with setTimeout and  setInterval.

setTimeout allows to run a function once after the interval of time.


The syntax:

let timerId = setTimeout(func|code, delay[, arg1, arg2...])

func|code -  Function or a string of code to execute. Mostly, this will be a function. But some peoples may pass a string of code and its not recommended. The reason I have mentioned in Javascript interview section.

delay -  The delay before run, should be mentioned in milliseconds (1000 ms = 1 second).

arg1, arg2…  - arguments.

Simple Example:

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function sayHi(welcomeMsg, user) { alert( welcomeMsg + ', ' + user ); } setTimeout(sayHi, 5000, "Hello", "Raj"); // Hello, Raj

Explanation:

The sayHi method will be called after 5 seconds. Just compare this example with syntax. Hope you got it.

Note:

Do not pass like sayHi(). You should pass always method name only like sayHi without brackets.