JS Practice — Built-in Objects

toPrecision() — 5 significant digits

📖 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.

Number.prototype.toPrecision()

num.toPrecision(precision?) returns a string with the specified number of significant digits.

(123.456).toPrecision(5)  // → '123.46'

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