JS Practice — Built-in Objects

toPrecision() — large number uses exponential notation

📖 Usage Example

// Format number to a specified precision
(123.456).toPrecision(5)    // → '123.46'
(0.000123).toPrecision(2)   // → '0.00012'

Use toPrecision() to format a number to a total number of significant digits, which is useful in scientific or measurement contexts.

toPrecision() — Exponential Notation

For large numbers with fewer significant digits than the number requires, exponential notation is used.

(123456789).toPrecision(4)  // → '1.235e+8'

💡 Hints (1)

• When the precision is less than the number of digits, exponential notation is used.