toSI() on a scalar

Is there a way to make toSI() work on a scalar? The use case is when I want to display the result of an expression in SI unit if it has units. Like this:

• math.evaluate(‘1 cm’).toSI() --> 0.01 m
• math.evaluete(‘2cm / 1cm’).toSI() --> 2

Or, is there a function that works like hasunit in the following example?

if (hasunit(var)) {
print(var.toSI());
}
else {
print(var);
}

[rnd-debug]

I also wasn’t confortable with extending JS Number, so I assume that I can close the PR 😇 One dirty code snippet:

const mathjs =  require('mathjs')
const config = {predictable :true }
const math = mathjs.create(mathjs.all, config)
console.log(math.typeOf(math.evaluate('4m / 1m')))         // Unit
console.log(math.evaluate('4m / 1m').toSI().toString())      // 4

[josdejong]

👍

Thanks @rnd-debug for all your inputs.