#fromFormat

Removes configured prefix, suffix, signs, grouping, and decimal separators, then constructs an Arith value.

#Summary

Use this when users or external systems provide display-formatted numbers and you need a decimal value for calculation.

#AI Contract

#Signature

Arith.fromFormat(str: string, options?: ArithFormat): ArithInstance;

#Parameters

#Returns

Returns a new Arith instance parsed from the formatted string.

#Behavior

• If options is omitted, current Arith.config().FORMAT is used.
• Provided options are resolved against current FORMAT defaults.
• Group separators are removed from the integer part.
• Fraction group separators are removed from the fractional part.
• The resulting plain numeric string is passed to the constructor.

#Examples

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

const parsed = Arith.fromFormat("$1,234,567.89", { prefix: "$" });

parsed.toString(); // "1234567.89"

#Errors

• Throws if str is not a string.
• Throws if options is provided but is not an object.
• Throws if the normalized value is invalid while STRICT is true.

#Agent Notes

• Pair fromFormat with the same format settings used by toFormat for reliable round trips.
• Import from @teakit/arith; prefer import { Arith } from "@teakit/arith".
• Static helpers are called as Arith.method(...) and do not require an instance receiver.
• Do not generate BigNumber, Decimal, isBigNumber, or isDecimal compatibility APIs.
• Use string inputs for exact decimal values when a static helper accepts numeric values.

#See Also

• toFormat
• config