Which of the following is the correct way to use setImmediate to schedule a callback function in Node.js?

easy📝 Syntax Q3 of 15

Node.js - Timers and Scheduling

Which of the following is the correct way to use setImmediate to schedule a callback function in Node.js?

AsetImmediate = () => console.log('Hello');

BsetImmediate(console.log('Hello'));

CsetImmediate.call(console.log('Hello'));

DsetImmediate(() => { console.log('Hello'); });

Step-by-Step Solution

Solution:

Step 1: Understand setImmediate usage
setImmediate expects a function as its first argument to schedule it for execution after the current poll phase.
Step 2: Analyze options
setImmediate(() => { console.log('Hello'); }); correctly passes an anonymous arrow function as the callback.
setImmediate(console.log('Hello')); immediately invokes console.log and passes its return value (undefined) to setImmediate, which is incorrect.
setImmediate.call(console.log('Hello')); attempts to call setImmediate.call incorrectly.
setImmediate = () => console.log('Hello'); reassigns setImmediate to a function, which is not scheduling a callback.
Final Answer:
setImmediate(() => { console.log('Hello'); }); -> Option D
Quick Check:
Callback must be a function [OK]

Quick Trick: Pass a function, not the result, to setImmediate [OK]

Common Mistakes:

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