JavaScript Generators — Practical Use Cases

JavaScript Generators — Practical Use Cases

JavaScript Generators — Practical Use Cases. What’s a generators? Are there concrete and practical Use-Cases for generator? For JavaScript Generators. practical-use-case-for-javascript-generator. "values : ", 17

What’s a generator? How it can be helpful? Are there concrete and practical use cases for generators?

Types of Functions in JavaScript

Run-to-completion functions

Let’s look at this function:

const doOperations = (x, y) => {
  const operation1 = x + y;
  console.log('operation1 : ', operation1);
  const operation2 = operation1 - y;
  console.log('operation2 : ', operation2);
  const operation3 = (operation1 * operation2) + 2 * (x - y);
  console.log('operation3 : ', operation3);
  return operation3;

console.log('doOperations : ', doOperations(3, 2));

"operation1 : ", 5
"operation2 : ", 3
"operation3 : ", 17
"doOperations : ", 17

Once invoked, this function will run until the last line: an unstoppable or run-to-completion function. Execution context will be released after completion.

Run-to-completion functions are about the present: We need the result right away.

What if operation1's execution takes a long time? Since JavaScript is a single thread, all further processing will be blocked until operation1 finishes its computation.

Can we do better? Yes, let’s look.

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