What is float precision in JavaScript?

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Khushi Singh · Answer

Precision in JavaScript relating to floating point refers to how accurate the decimal numbers are handled. JavaScript stores numbers as the 64 floating point format compliant with IEEE 754 standard, which causes precise arithmetic errors if decimals are used.

console.log(0.1 + 0.2); // Outputs: 0.30000000000000004

This occurs due to a phenomenon, where, not all decimal fractions can be accurately approximated when converted to binary representation which is used internally. To handle such cases, you can use methods like toFixed() or toPrecision() to control the number of decimal places:

console.log((0.1 + 0.2).toFixed(2)); // Outputs: "0.30"

If you'd like to dive deeper into JavaScript concepts, here is our guide

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What is float precision in JavaScript?

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