This content originally appeared on DEV Community and was authored by Coderslang: Become a Software Engineer
What will be logged to the console?
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At a first glance, the answer is true as 0.1 + 0.1 + 0.1 is obviously equal to 0.3 .
But that’s only before we get into the details of how the numbers are represented in JavaScript.
If you try to execute the statement console.log(0.1 + 0.2) in JS, you’ll get a number 0.30000000000000004.
This happens because in JavaScript and quite a few other programming languages some decimal numbers can't be represented exactly as they are.
For example 0.1 in binary will result in an endless fraction, the same way as 1/3 becomes 0.333(3) in the decimal number system.
ANSWER: false will be logged to the console.
This content originally appeared on DEV Community and was authored by Coderslang: Become a Software Engineer
Coderslang: Become a Software Engineer | Sciencx (2021-04-14T14:47:43+00:00) JavaScript Interview Question #32: 0.1 + 0.1 + 0.1 === 0.3. Retrieved from https://www.scien.cx/2021/04/14/javascript-interview-question-32-0-1-0-1-0-1-0-3/
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