Why Does Dot Notation Fail with Integers in JavaScript?

Why Dot Notation Fails with Integers

Developers may encounter a syntax error when attempting to access a property of an integer using a single dot, despite its success when applied to other data types. The culprit lies in the period's dual nature.

The period (.) is intrinsic to the integer. Consider the code:

3.toFixed(5)

The interpreter treats this as:

(3.)toFixed(5)

Since identifiers cannot immediately follow a number, a syntax error ensues.

Alternative Approaches

To resolve this issue, separate the period from the integer using any of these methods:

• Parentheses: (3).toFixed(5)
• Space: 3 .toFixed(5)
• Double dots: 3..toFixed(5)
• Bracket notation: 3["toFixed"](5)

Optimal Solution

For clarity, the preferred approach is to enclose the number in parentheses:

(3).toFixed(5)

This explicitly separates the period from the integer, preventing any ambiguity.

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