round()

round(n, precision?): number

Computes number rounded to precision.

DEPRECATED

Use Math.round() directly instead.

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Parameters

n: number

The number to round.

precision?: number = 0

The precision to round to. Defaults to 0.

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Returns: number

The rounded number.

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See Also

Math.round() - MDN

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Since

2.0.0

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Also known as

round (Lodash, es-toolkit) · ❌ (Remeda, Radashi, Ramda, Effect, Modern Dash, Antfu)

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Example

// ❌ Deprecated approach
round(4.006);      // => 4
round(4.006, 2);   // => 4.01
round(4060, -2);   // => 4100

// ✅ Recommended approach
Math.round(4.006);             // => 4
Math.round(4.006 * 100) / 100; // => 4.01
Math.round(4060 / 100) * 100;  // => 4100

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How it works?

Rounds number to specified precision. Deprecated: Use Math.round() directly.

Native Equivalent

// ❌ round(value)
// ✅ Math.round(value)
// ✅ Math.round(value * 100) / 100  // for precision

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Use Cases

Round numbers 📌

Round numbers to integers.

#round#ceil#floor#math

Math.ceil(4.3);   // => 5
Math.floor(4.7);  // => 4
Math.round(4.5);  // => 5

Round to decimals

Round to specific decimal places.

#round#decimals#precision

const round2 = (n) => Math.round(n * 100) / 100;
round2(4.567);  // => 4.57

Pagination math

Calculate page count.

#pagination#pages#ceil

const totalPages = Math.ceil(totalItems / pageSize);