Can I do math with strings?

Yes and no. If you use `+`, JavaScript concatenates them (e.g., `'5' + 5` is `'55'`). If you use `-`, `*`, or `/`, JavaScript tries to convert the string to a number (e.g., `'10' - 5` is `5`).

What does `NaN` mean?

`NaN` stands for 'Not a Number'. It happens when a math operation fails, like trying to divide a string of text by a number.

Is `&&` evaluated before `||`?

Yes, `&&` has a higher operator precedence than `||`. Use parentheses `()` to enforce the order of evaluation you want.

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JS Operators | JavaScript Tutorial

Learn about JS Operators in this comprehensive JavaScript tutorial for web development. Master the tools of computation. Learn to use arithmetic, assignment, comparison, and logical operators to build sophisticated decision-making systems in your code.

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Operator Core

The foundations of JavaScript computation.

Operators are the verbs of your programming language. They define the actions you perform on your data, from simple addition to complex logical evaluation.

1Math & Assignment

Arithmetic operators (+, -, *, /, %) handle the raw computation in your app. A key best practice is understanding the Modulo (%) operator for cycle management and even/odd logic. Assignment operators like += provide a concise way to update state, making your code cleaner and less prone to repetitive typing errors.

2The Decision Gates

Comparison and Logical operators are the 'gatekeepers' of your program. Strict Equality (===) is non-negotiable in modern JavaScript—it prevents 'Type Coercion', ensuring that the browser doesn't try to guess if a string '5' is equal to a number 5. Combining these with && (AND) and || (OR) allows you to build complex conditional logic trees with mathematical precision.