Temporal.PlainTime.prototype.valueOf()
Limited availability
This feature is not Baseline because it does not work in some of the most widely-used browsers.
The valueOf() method of Temporal.PlainTime instances throws a TypeError, which prevents Temporal.PlainTime instances from being implicitly converted to primitives when used in arithmetic or comparison operations.
Syntax
valueOf()
Parameters
None.
Return value
None.
Exceptions
TypeError-
Always thrown.
Description
Because both primitive conversion and number conversion call valueOf() before toString(), if valueOf() is absent, then an expression like time1 > time2 would implicitly compare them as strings, which may have unexpected results. By throwing a TypeError, Temporal.PlainTime instances prevent such implicit conversions. You need to explicitly convert them to strings using Temporal.PlainTime.prototype.toString(), or use the Temporal.PlainTime.compare() static method to compare them.
Examples
Arithmetic and comparison operations on Temporal.PlainTime
All arithmetic and comparison operations on Temporal.PlainTime instances should use the dedicated methods or convert them to primitives explicitly.
const time1 = Temporal.PlainTime.from("00:00:00");
const time2 = Temporal.PlainTime.from("12:00:00");
time1 > time2; // TypeError: can't convert PlainTime to primitive type
Temporal.PlainTime.compare(time1, time2); // -1
time2 - time1; // TypeError: can't convert PlainTime to primitive type
time2.since(time1).toString(); // "PT12H"
Specifications
| Specification |
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| Temporal # sec-temporal.plaintime.prototype.valueof |
Browser compatibility
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Legend
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- Full support
- Full support
- In development. Supported in a pre-release version.
- In development. Supported in a pre-release version.
- No support
- No support
- See implementation notes.