JSLint が JavaScript でインクリメント ( ) 演算子とデクリメント (--) 演算子を避けることを推奨しているのはなぜですか?

Understanding the Avoidable Operators in JavaScript

JavaScript's jslint tool suggests avoiding the increment (++) and decrement (--) operators due to their potential contribution to coding issues.

Off-by-One Errors and Loop Control

In languages like PHP, the use of ++ within loop constructs can lead to off-by-one errors. However, in JavaScript, it is still possible to control loops with syntax such as:

while (a < 10) {
  /* foo */
  a++;
}

or

for (var i = 0; i < 10; i++) {
  /* foo */
}

JSLint's Rationale

The jslint tool highlights ++ and -- due to their potential in other programming languages, such as C, where their usage can differ or lead to issues. However, in JavaScript, these operators are generally safe and can enhance code readability in certain scenarios.

Best Practices

For optimal code clarity, it is recommended to use ++ and -- by themselves on separate lines, as demonstrated below:

i++;
array[i] = foo;

instead of

array[++i] = foo;

Idiomatic Usage in For Loops

An exception to this best practice is within for loops, where the use of the increment operator is idiomatic and contributes to code clarity.

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