assignment.md

Assignment Operators

An assignment operator assigns a value to its left operand based on the value of its right operand.

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Assignment_Operators

---

You may do chain assignment.

// ok
const a = b = 1

Why?

In JavaScript, chain assignment is not a good idea because you might introduce global variable if you are not careful.

However, in TypeScript you don't have this problem because the compilier will spot the error for you 😎.

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You should not have linebreaks before or after = in an assignment.

// bad
const foo =
  'foo'

// bad
const foo
  = 'foo'

// good
const foo = 'foo'

Why?

These incidental linebreaks would throw off tools that rely on comments.

// bad, broke tooling
// istanbul ignore next
// tslint:disable-next-line
const foo =
  somethingToIgnore()

// good
// istanbul ignore next
// tslint:disable-next-line
const foo = somethingToIgnore()