Question

How to get the first digit after the decimal point of a float number in Node.js

Answer 1

function firstDecimalDigit(f) {
    return f.toString().split('.')[1][0]
}

const f = 891.79234;

console.log(firstDecimalDigit(f));  


/*
run:

7

*/

 

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Answer 2

function firstDecimalDigit(f) {
    return Math.floor(Math.abs(f) * 10)) % 10; 
}

const f = 891.79234;

console.log(firstDecimalDigit(f));  


/*
run:

7

*/

 

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