Timer in Node

Node.js provides several timer functions for scheduling code execution. Understanding these is essential for Node.js development.

Key Concepts

setTimeout - one-time execution
setInterval - repeated execution
setImmediate - next event loop
process.nextTick - highest priority

Example 1

setImmediate(() => console.

log("hello")); setTimeout(() => console.

log("setTimeout"), 10); process.

nextTick(() => console.

log("nextTick")); First event queue ends here.

Code

setImmediate(function A() {
  console.log("1st immediate");
});
setImmediate(function B() {
  console.log("2nd immediate");
});
process.nextTick(function C() {
  console.log("1st process");
});
process.nextTick(function D() {
  process.pid;
  console.log("2nd process");
});
console.log("program started");

Summary

Understanding timer is essential for mastering node. Practice these examples and experiment with variations to deepen your understanding.

Key Takeaways

timer is a fundamental concept in node
Practice with these examples to build confidence
Experiment with variations to explore edge cases
Understanding timer will help you in technical interviews

timer.js

// setImmediate(() => console.log("hello"));
// setImmediate(() => console.log("hello"));
// setImmediate(() => console.log("hello"));
// setImmediate(() => console.log("hello"));
// setTimeout(() => console.log("setTimeout"), 10);

// process.nextTick(() => console.log("nextTick"));

setImmediate(function A() {
  console.log("1st immediate");
});

setImmediate(function B() {
  console.log("2nd immediate");
});

process.nextTick(function C() {
  console.log("1st process");
});

process.nextTick(function D() {
  process.pid;
  console.log("2nd process");
});

// First event queue ends here
console.log("program started");

Timer in Node

Timer in Node

Key Concepts

Example 1

Code

Summary

Key Takeaways

Try It Yourself

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