Question

How to truncate a number from left in JavaScript

Answer 1

function truncate_left(num) {
    const total = parseInt(Math.log10(num));
    
    const first_digit = parseInt(num / parseInt(Math.pow(10,(total))));

    return num - first_digit * parseInt(Math.pow(10,(total)));
}

const num = 7483;

console.log(truncate_left(num));



/*
run:

483

*/

 

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