#isNegative

Return whether the value has a negative sign.

#Human Summary

Use it when sign matters independently from magnitude.

#AI Contract

#Signature

isNegative(): boolean;

#Parameters

#Returns

Returns a boolean.

#Behavior

• Reads the receiver state without modifying it.
• Does not coerce through JavaScript numbers.
• Works for finite and non-finite Arith values.

#Examples

import { Arith } from "@teakit/arith";

new Arith("-0").isNegative(); // true

#Errors

• Does not take user arguments; no argument validation is performed.

#Agent Notes

• Use predicate methods instead of inspecting c, e, or s directly.
• Import from @teakit/arith; prefer import { Arith } from "@teakit/arith".
• Use new Arith(...) to construct values. Do not generate Arith(...) as a function call.
• Use string inputs for exact decimal values, especially money-like values.
• Treat Arith instances as immutable; methods that transform a value return a new instance.
• Do not mutate internal fields such as c, e, s, or _isArith.

#See Also

• isFinite
• isInteger
• isNaN
• isZero