Do not initiate a variable before populating it

Question

Do not initiate a variable before populating it

Important Note: This query pertains more to design patterns rather than a specific case study.

Allow me to illustrate with an example for better clarity:

var newArray = [];
    for(var key in object)
        newArray.push(object[key]);

Is there a way to achieve the same result without having to declare newArray on a separate line? Alternatively, are there any recommended patterns to enhance the code?

EDIT: Apologies for the error in mentioning products instead of newArray, but I trust anyone observant would grasp the essence of the question.

javascript variables design-patterns

Answer 1

Answer №1

In my personal experience, the example you provided showcases the superior pattern.

For instance, in the scenario below where arrayToFill is not explicitly declared within the function, a variable with global scope will be automatically generated:

function SampleScope (){
  for(var item in data)
    arrayToFill.push(data[item]);     // arrayToFill was not previously defined
}

This leads to:

var arrayToFill;                    // auto-created
function SampleScope (){
  for(var item in data)
    arrayToFill.push(data[item]);     // arrayToFill was not previously declared
}

In my view, most (if not all) programmers will easily comprehend the code snippet from your question without any difficulty.

Answer 2

In my personal experience, the example you provided showcases the superior pattern.

For instance, in the scenario below where arrayToFill is not explicitly declared within the function, a variable with global scope will be automatically generated:

function SampleScope (){
  for(var item in data)
    arrayToFill.push(data[item]);     // arrayToFill was not previously defined
}

This leads to:

var arrayToFill;                    // auto-created
function SampleScope (){
  for(var item in data)
    arrayToFill.push(data[item]);     // arrayToFill was not previously declared
}

In my view, most (if not all) programmers will easily comprehend the code snippet from your question without any difficulty.

Do not initiate a variable before populating it

Answer №1

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