Formatting and parsing
function O.numberFormatter(format)
Returns a function which takes a single numeric argument, and returns a string representation according to format
.
If a function is passed to this function, it will return the function unaltered. This is so APIs can take format strings or custom formatters, and pass them through O.numberFormatter()
to get a formatter function.
The format
string uses the same formats as Java’s java.text.DecimalFormat
.
For performance, call this once to create a formatter which is called many times.
let formatter = O.numberFormatter("#,##0.00"); let string = formatter(123456); // Reuse formatter to format other numbers.
function O.dateParser(format)
Returns a function which takes a single string argument, and returns a Date
parsed according to format
.
The format
string uses the same formats as Java’s java.text.SimpleDateFormat
.
If the string passed to the parser does not match the format, null
is returned.
For performance, call this once to create a parser which is called many times.
let parser = O.dateParser("yyyy-MM-dd"); let date = parser("2018-02-12"); // Reuse parser for any other dates.