Question 364107 in Javascript Question posted in
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Javascript – How to access Parent Variable from Function JS

What’s the correct way to access x?

let x = 5
const f = (n:number)=> {
  let x = "Welcome";
  return x * n // First x not second x
  }

and what’s the correct technical name for this operation?

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2

Answers


  1. 0

    One way is to use block scope and OR operator.

    {
  let x = 5
  const f = (n) => {
    x = x || "Welcome";
    return x * n // First x not second x
  }
  f(1)
}

    Another way is to define x as a default paramter to f

    let x = 5
const f = (n, z = x)=> {
  let x = "Welcome";
  return z * n // First x not second x
}
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  2. 0

    The correct way to access a shadowed variable is not to shadow it. Refactor the code by renaming either variable to something else – typically the local one (in the inner scope).

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