Is it considered poor coding practice to have a return statement within every iteration of a map loop?

While I appreciate the functionality of this map, I can't help but wonder if it's considered poor practice to use return on every iteration of a loop.

Would using return in every iteration be deemed as bad practice?

Thank you

const array = [
  ["Header 1", "Header 2"],
  [1, 2],
  [3, 4],
];

const mappedArray = array.map((row, index) => {
  if (index === 0) {
    return row;
  } else {
    return row.map((value) => value * 2);
  }
});

I have attempted to research this issue but unfortunately came up empty-handed.

Answer №1

It's all good, the array.map function operates by executing your provided function to determine how to map the values.

The primary consideration is how frequently you are calling the variable; if it's infrequent, there's no need for concern.

Answer №2

It is crucial to remember to return on each iteration of the Array.map method. There is a similar Array.forEach method that behaves in the same way, but it does not automatically generate an array. If your goal is to perform an action on each item in the array rather than returning an array, using the forEach method can save some memory. However, if your specific case requires the functionality of the map function over forEach, returning is necessary. Failing to do so will not cause the application to crash, but it could result in unnecessary variable assignment or memory usage.

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