tslint issues detected within a line of code in a function

  • I am a novice when it comes to tslint and typescript.
  • Attempting to resolve the error: Unnecessary local variable - stackThird.
  • Can someone guide me on how to rectify this issue?
  • Despite research, I have not been successful in finding a solution.

  • The error is related to the following line of code: let stackThird = stackSecond + "/" + stackFirst.stackTags() + "/" + stackFirst.stackFour(); // +" "+Time;

  • Providing the code snippet below for reference:

  • I have also explored this link but unable to make progress

https://github.com/Microsoft/tslint-microsoft-contrib

Error: Unnecessary local variable - stackThird

 public stackTags(): any {
    let stackFirst = new Date();
    let stackSecond = stackFirst.stackFive();
    stackSecond++;
    let stackThird = stackSecond + "/" + stackFirst.stackTags() + "/" + stackFirst.stackFour(); // +" "+Time;
    return stackThird;
  }
javascriptjqueryangularjstypescripttslint

Answer №1

Modify the code snippet below:

let stackThird = stackSecond + "/" + stackFirst.stackTags() + "/" + stackFirst.stackFour();
return stackThird;

to:

return stackSecond + "/" + stackFirst.stackTags() + "/" + stackFirst.stackFour();

The issue arises from creating an unnecessary variable (stackThird). It is recommended to directly return the concatenated value instead of assigning it to a variable first and then returning the variable.

Answer №2

The guideline known as no-unnecessary-local-variable states the following:

Avoid declaring a variable solely to return it from the function on the next line. It is usually more concise to directly return the expression that initializes the variable.

This rule is not included in the standard tslint rules; it comes from the tslint-microsoft-contrib extension, which enforces even stricter coding standards.

If you disagree with this rule (personally, I have disabled it in my projects), you can do so by modifying your tslint configuration file:

// tslint.json
{
    "rulesDirectory": [
        "node_modules/tslint-microsoft-contrib"
    ],
    "rules": {
        "no-unnecessary-local-variable": false
    }
}

Alternatively, you can adhere to the rule by returning the computed result directly without using an unnecessary variable:

return stackSecond + "/" + stackFirst.stackTags() + "/" + stackFirst.stackFour();

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