How multiple question marks "?" and colons ":" in one statement are interpreted in javascript? (Conditional Operators)

Question

I know that how simple conditional statements are interpreted, like

condition ? expr1 : expr2 

But I wanted to know how such a statement is interpreted?

function arc() {
    ...
    return da >= d3_svg_arcMax ? r0 ? "String1" : "String2" : r0 ? "String3" : "String4";
}

No need to explain this long expression. I just need to know what it means when multiple question marks and colons are used together like in this example.

Thank you

Answer 1

Javascript is right-associative, so you 'resolve' the ternaries from right to left.