Javascript error on Safari

Question

I'm having some problems with javascript on desktop safari, on mobile is working fine.

When I try to run:

return Math.trunc(num * Math.pow(10, 2)) / Math.pow(10, 2);

I'm getting on console:

TypeError: 'undefined' is not a function (evaluating 'Math.trunc(num * Math.pow(10, 2))')

Any idea why can it be? On the rest of browsers is working perfectly and I have no clue why (I've never worked with safari).

Answer 1

Math.trunc was added in ES2015 (June 2015). Apparently the JavaScript engine in the version of Safari you're using doesn't have it yet.

You could polyfill it if it's missing:

if (!Math.trunc) {
    Object.defineProperty(Math, "trunc", {
        value: function(val) {
            return val < 0 ? Math.ceil(val) : Math.floor(val);
        }
    });
}

Answer 2

What about return ~~(num * Math.pow(10, 2)) / Math.pow(10, 2); ?

The ~~ operator seems to be a good replacement for Math.trunc()