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@zimatech/named-replacer-args

v1.0.2

Published

Turns the arguments of a replacer function in `String.replace` and `String.replaceAll` into an object with useful names.

Readme

| Item | Description |---|---| | function nameReplacerArgs | Turns the arguments of a replacer function in String.replace and String.replaceAll into an object with useful names.| | interface NamedReplacerArgs | Return type of nameReplacerArgs. | |  match | The matched substring. | |  ps | The strings found by capture groups. | |  offset | The offset of the matched substring within the whole string being examined. | |  string | The whole string being examined. | |  groups | An object whose keys are the used group names, and whose values are the matched portions. | | type GroupsType | Type of NamedReplacerArgs.groups, basically Record<string, string \| undefined> \| undefined. |

function nameReplacerArgs

export function nameReplacerArgs<GroupNames extends string | unknown = unknown>(
  args: unknown[],
): NamedReplacerArgs<GroupNames> 

Turns the arguments of a replacer function in String.replace and String.replaceAll into an object with useful names. The replacer functions' parameters are defined as:

parameters = match "," p1 {"," pn} "," offset "," string ["," groups];

[!NOTE]
The number of parameters depends on the number of capturing groups as well as the presence of named capturing groups.

  • @param args — The arguments passed to the replacer function in String.replace and String.replaceAll.
  • @typeParam GroupNames - (optional) Names of named groups. Pass multiple as union (e.g. 'firstName' | 'lastName')
  • @returns — An object with keys corresponding the replacer functions arguments' meaning.
  • @example
'hello'.replace(/^(?<initial>.)(?<rest>.*)/, (...args) => {
  const namedArgs = nameReplacerArgs<'initial' | 'rest'>(args)
  return `~${namedArgs.groups.initial}~${namedArgs.groups.rest}`
})
  • @see NamedReplacerArgs

interface NamedReplacerArgs

export interface NamedReplacerArgs<
  GroupNames extends string | unknown = unknown,
>

Return type of nameReplacerArgs.

  • @typeParam GroupNames - Names of named groups.

match

match: string

The matched substring.

ps

ps: string[]

The strings found by capture groups.

offset

offset: number

The offset of the matched substring within the whole string being examined.

string

string: string

The whole string being examined.

groups

groups: GroupsType<GroupNames>

An object whose keys are the used group names, and whose values are the matched portions.

  • @see GroupsType

type GroupsType

type GroupsType<GroupNames>

Type of NamedReplacerArgs.groups, basically Record<string, string | undefined> | undefined.

  • @typeParam GroupNames - Names of named groups as keys or unknown. If keys are defined, the groups property type can be narrowed to Record<GroupNames, string | undefined>.