Frequency

On this page

Shape
Example
Good to know
In JSON
Details

How often something happens per second: 50Hz or 2.4GHz.

Use it for mains, radio and processor speeds. For a heartbeat, use HeartRate. For video, use FrameRate.

Shape

One value, with no fields to fill in. As text it reads 2400000000 Hz.

Example

example

Frequency(50Hz)

text.parse(raw, as: Frequency) reads one from text that comes from outside. Text that isn't one at all fails malformed, such as 5, 1.2.3 or five.

These operations give one: units.of and units.sum.

Good to know

It is held in hertz to 3 places.
== tells you whether two are the same, and < and list.sort_by compare and sort them.

In JSON

An object of its parts, in a request, a response or json.write:

json

{"value":"50","unit":"Hz"}{"value":"440","unit":"Hz"}{"value":"2400000000","unit":"Hz"}

Details

Text form, storage, how it is shown, and operations

Frequency is in the group Physical quantities, and has been in Jadpo since 0.1.0.

Text form

text.from writes one standard text form, the same form text.parse reads back: 50 Hz, 440 Hz and 2400000000 Hz.

How it is stored

It is stored in one column named for the field, of type numeric(38, 3), holding the frequency in hertz (Hz). 440 Hz is stored as 440.

How it is shown to people

text.format(value, locale:) shows it to people in their locale. A call may also give unit:.

With locale: Locale.en_gb:

Value	Shown
`50 Hz`	`50 Hz`
`440 Hz`	`440 Hz`
`2400000000 Hz`	`2,400,000,000 Hz`

Operations

units.in(value: Quantity, unit: QuantityUnit, scale: Int, rounding: Rounding) -> Decimal: value in unit, a unit of its kind, as a Decimal of scale places rounded by rounding: units.in(5km, LengthUnit.mile, scale: 2, rounding: Rounding.half_even) is 3.11.
units.of(value: Number, unit: QuantityUnit) -> Quantity: value of unit, an Int or a Decimal, as the quantity of unit's kind, converted exactly to the base unit and rounded half to even to the kind's scale: units.of(5, LengthUnit.mile).
units.sum(items: List<Quantity>) -> Quantity: The items added up, all of one kind; nothing for no items. A Temperature or a SoundLevel doesn't add to itself, so neither is summed.

It also takes text.parse, text.from, text.format, json.read, json.write and ==. How every standard type behaves says how they work.

Markdown for agents: /docs/types/type-frequency.md.Built from Jadpo main at aee2e8f.