Function parseInt (1/10000000) returns 1. Why?

Question

Why parseInt(1/10000000) results 1, when parseInt(1/1000000) result is 0?

I need some analog to Java's int casting like int i = -1/10000000;, Which is 0.

Should I use Math.floor for positive and Math.ceil for negative? Or is there another solution?

Answer 1

At first the question seems interesting. Then I looked at what 1/10000000 is.

< 1/10000000
> 1e-7

Therefore:

< parseInt("1e-7"); // note `parseInt` takes a STRING argument
> 1

If you want to truncate to an integer, you can do this:

function truncateToInteger(real) {
    return real - (real % 1);
}