Edit fiddle - JSFiddle - React, Tailwind, and code Playground

JSFiddle - React, Tailwind, and code Playground

JavaScript

const data = 1.256;
        const decimalPlaces = 2;
        const fractionalMultiple = 10 ** decimalPlaces;
        const valueWithFloor = (Math.floor( parseFloat(data) * fractionalMultiple) / fractionalMultiple).toFixed(decimalPlaces);
        const valueWithOutFloor = (Math.floor( parseFloat(data) * fractionalMultiple) / fractionalMultiple).toFixed(decimalPlaces);
        console.log('valueWithFloor',valueWithFloor)
        console.log('valueWithOutFloor',valueWithOutFloor)

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JSFiddle - React, Tailwind, and code Playground

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