[Pas2js] Built-in helper methods for Double type
warleyalex
warleyalex at yahoo.com.br
Wed Sep 4 13:23:04 CEST 2019
I came across this situation, when translating to pas2js:
// Determine X and cut to 2 decimals
x = (Math.sin(rad) * r).toFixed(2);
It would be nice if pas2js could extend the built-in Number methods for the
type Double, Integer, for instance: syntax something like:
var
x: string;
r, rad: Double;
begin
x:= (sin(rad) * r).toFixed(2);
struggling how to achieve this situation, an workaround would be:
I had to define an external class at the system unit, math section and a
public single function:
type
TJSNumber = class external name 'number'
function toString(radix: integer = 0): String;
function toFixed(fractionDigits: integer = 0): string;
function toExponential(fractionDigits: integer = 0): string;
function toPrecision(precision: integer): string;
end;
function NumberTo(const aNumber: Double): TJSNumber; external name ' ';
and then
// Determine X and cut to 2 decimals
x := NumberTo(sin(10.1) * 2.5).toFixed(2); // $mod.x = (Math.sin(10.1) *
2.5).toFixed(2);
--
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