25 lines
852 B
TypeScript
25 lines
852 B
TypeScript
import { getDecimalPlaces } from '$shared/lib/utils';
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/**
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* Round a value to the precision of the given step
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*
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* This fixes floating-point precision errors that occur with decimal steps.
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* For example, with step=0.05, adding it repeatedly can produce values like
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* 1.3499999999999999 instead of 1.35.
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*
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* We use toFixed() to round to the appropriate decimal places instead of
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* Math.round(value / step) * step, which doesn't always work correctly
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* due to floating-point arithmetic errors.
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*
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* @param value - The value to round
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* @param step - The step to round to (defaults to 1)
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* @returns The rounded value
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*/
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export function roundToStepPrecision(value: number, step: number = 1): number {
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if (step <= 0) {
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return value;
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}
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const decimals = getDecimalPlaces(step);
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return parseFloat(value.toFixed(decimals));
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}
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