25. Explicit Type Conversion

Explicit conversion (or 'casting') is when we intentionally use functions to convert values, instead of relying on JavaScript's automatic coercion.

1. Converting to Number

• Number(value): Converts the entire value to a number. If it fails, returns NaN.
• parseInt(string): Parses a string and returns an integer. Stops parsing at the first non-digit.
• parseFloat(string): Parses a string and returns a floating-point number.

javascript let ageStr = '30'; let ageNum = Number(ageStr); console.log(typeof ageNum); // 'number'

console.log(parseInt('45px')); // Output: 45 console.log(parseInt('a45')); // Output: NaN

2. Converting to String

Use the .toString() method or the String() function.

javascript let num = 123; console.log(num.toString()); // Output: '123' console.log(String(true)); // Output: 'true'

3. Converting to Boolean

Use Boolean(value).

javascript console.log(Boolean(1)); // true console.log(Boolean('')); // false (Falsy value) console.log(Boolean(0)); // false (Falsy value)