🤠 Object property paths with wildcards and regexps. 🌵
Get/set object properties using:
- ⛏️ Dot-delimited paths:
foo.bar.0.baz - ⭐ Wildcards:
foo.*,**.bar - 🗺️ Regexps:
foo./ba?/ - 🏜️ Slices:
foo.0:2 - 🚂 Unions:
foo bar baz
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npm install wild-wild-pathThis package works in both Node.js >=18.18.0 and browsers.
This is an ES module. It must be loaded using
an import or import() statement,
not require(). If TypeScript is used, it must be configured to
output ES modules,
not CommonJS.
target: Target
query: Query
options: Options?
Return value: any | undefined
Return the first property matching the query.
const target = { settings: { colors: ['red', 'blue'] } }
get(target, 'settings.colors.0') // 'red'
get(target, ['settings', 'colors', 0]) // 'red'target: Target
query: Query
options: Options?
Return value: boolean
Return whether the query matches any property.
const target = { settings: { lastName: undefined, colors: ['red', 'blue'] } }
has(target, 'settings.firstName') // false
has(target, ['settings', 'firstName']) // false
has(target, 'settings.lastName') // truetarget: Target
query: Query
options: Options?
Return value: any[]
Return all properties matching the query, as an array.
const target = {
userOne: { firstName: 'John', lastName: 'Doe', age: 72 },
userTwo: { firstName: 'Alice', colors: ['red', 'blue', 'yellow'] },
}
list(target, 'userOne.firstName userTwo.colors.0') // ['John', 'red']
list(target, [
['userOne', 'firstName'],
['userTwo', 'colors', 0],
]) // ['John', 'red']
list(target, 'userOne./Name/') // ['John', 'Doe']
list(target, ['userOne', /Name/]) // ['John', 'Doe']
list(target, 'userTwo.colors.*') // ['red', 'blue', 'yellow']
list(target, 'userTwo.colors.0:2') // ['red', 'blue']
list(target, '**.firstName') // ['John', 'Alice']
list(target, 'userOne.*', { entries: true })
// [
// { value: 'John', path: ['userOne', 'firstName'], missing: false },
// { value: 'Doe', path: ['userOne', 'lastName'], missing: false },
// { value: 72, path: ['userOne', 'age'], missing: false },
// ]target: Target
query: Query
options: Options?
Return value:
Iterable<any>
Return all properties matching the query, as an
iterable.
This is slower than list() but uses less memory.
const target = { settings: { colors: ['red', 'blue'] } }
for (const color of iterate(target, 'settings.colors.*')) {
console.log(color) // 'red', 'blue'
}target: Target
query: Query
value: any
options: Options?
Return value: Target
Sets all properties matching the query. The return value is a deep clone
unless the mutate option is true.
const target = { colors: ['red', 'blue'] }
set(target, 'colors.0', 'yellow') // ['yellow', 'blue']
set(target, ['colors', 0], 'yellow') // ['yellow', 'blue']
set(target, 'colors.-1', 'yellow') // ['red', 'yellow']
set(target, 'colors.-0', 'yellow') // ['red', 'blue', 'yellow']
set(target, 'colors.*', 'yellow') // ['yellow', 'yellow']
set({}, 'user.0.color', 'red') // { user: [{ color: 'red' }] }
set({}, 'user.0.color', 'red', { missing: false }) // {}target: Target
query: Query
options: Options?
Return value: Target
Delete all properties matching the query. The return value is a deep clone
unless the mutate option is true.
const target = { user: { firstName: 'John', lastName: 'Doe', age: 72 } }
remove(target, 'user.lastName') // { user: { firstName: 'John', age: 72 } }
remove(target, 'user./Name/') // { user: { age: 72 } }
remove(target, ['user', /Name/]) // { user: { age: 72 } }wild-wild-utils is a separate
library which provides with additional, higher-level methods:
map(),
merge(),
push(),
unshift(),
find(),
pick(),
include(),
exclude(),
flatten().
The target value must be an object or an array.
There are two equivalent formats for queries: strings and arrays.
- Query strings are friendlier to CLI usage, more expressive, and easier to serialize.
- Query arrays are friendlier to programmatic usage, and faster. Also, they do not require escaping, so they should be used when the input is dynamic or user-provided to prevent injection attacks.
# Deep properties of objects or arrays.
# Dots are used for array indices, not brackets.
# Symbol properties are always ignored.
user.colors.0# Unions ("or") of queries are space-delimited.
# The string must not be empty.
colors name age# Shallow wildcards target all properties/items of a single object/array
user.*
# Deep wildcards target all properties/items of 0, 1 or many objects/arrays
user.**
**.colors# Regexps match property names
user./name/
# Flags can be used, e.g. to make it case-insensitive
user./name/i
# ^ $ must be used to match from the beginning or until the end
user./^name$/i# Array indices are integers
user.colors.0
# Array indices can be negative.
# -1 is the last item.
# -0 is the item after it, which can be used to append.
user.colors.-1# Array slices. Goes from the start (included) to the end index (excluded).
user.colors.0:2
# The start index defaults to 0, i.e. the beginning
user.colors.:2
# The end index defaults to -0, i.e. the end
user.colors.0:
user.colors.:# Dots, spaces and backslashes in property names must be escaped
name\\ with\\ spaces
name\\.with\\.dots
name\\\\with\\\\backslashes
# Ambiguous property names must be escaped with a backslash at the beginning.
# This includes properties that:
# - Are integers but are not array elements
# - Have multiple slashes and start with one
name.\\0
name.\\/not_a_regexp/# A leading dot can optionally be used. It is ignored.
user.colors
.user.colors
# Root value
.
# Empty string properties
user..colors// Deep properties of objects or arrays.
// Symbol properties are always ignored.
['user', 'colors', 0]// Unions ("or") of queries are arrays of arrays.
// There must be at least one item.
[['colors'], ['name'], ['age']]// Shallow wildcards target all properties/items of a single object/array
['user', { type: 'any' }]
// Deep wildcards target all properties/items of 0, 1 or many objects/arrays
['user', { type: 'anyDeep' }]
[{ type: 'anyDeep' }, 'colors']// Regexps match property names
['user', /name/]
// Flags can be used, e.g. to make it case-insensitive
['user', /name/i]
// ^ $ must be used to match from the beginning or until the end
['user', /^name$/i]// Array indices are integers, not strings
['user', 'colors', 0]
// Array indices can be negative.
// -1 is the last item.
// -0 is the item after it, which can be used to append.
['user', 'colors', -1]// Array slices. Goes from the start (included) to the end index (excluded).
['user', 'colors', { type: 'slice', from: 0, to: 2 }]
// The start index defaults to 0, i.e. the beginning
['user', 'colors', { type: 'slice', to: 2 }]
// The end index defaults to -0, i.e. the end
['user', 'colors', { type: 'slice', from: 0 }]
['user', 'colors', { type: 'slice' }]// Escaping is not necessary with query arrays
['name with spaces']
['name.with.dots']
['name\\with\\backslashes']
['name', '0']
['name', '/not_a_regexp/']// Root value
[]
// Empty string properties
['user', '', 'colors']A "path" is any query using only property names and positive array indices. This excludes negative indices, slices, wildcards, regexps and unions.
Paths are returned by the entries option.
# Path string
user.colors.0// Path array
['user', 'colors', 0]wild-wild-parser can be used to
convert between both formats, or to compare queries.
Object properties with a defined key but an undefined value are not ignored.
However, object properties without any defined key are ignored. The
has() method, missing option and
entries option can be used to distinguish those.
const target = { name: undefined }
has(target, 'name') // true
has(target, 'colors') // false
get(target, 'name') // undefined
get(target, 'colors') // undefined
get(target, 'name', { entries: true, missing: true })
// { value: undefined, path: ['name'], missing: false }
get(target, 'colors', { entries: true, missing: true })
// { value: undefined, path: ['colors'], missing: true }
list(target, '*') // [undefined]
list(target, '*', { entries: true })
// [{ value: undefined, path: ['name'], missing: false }]Options are optional plain objects.
Methods: set(),
remove()
Type: boolean
Default: false
By default, the target is deeply cloned.
When true, it is directly mutated instead, which is faster but has side
effects.
const target = {}
console.log(set(target, 'name', 'Alice')) // { name: 'Alice' }
console.log(target) // {}
console.log(set(target, 'name', 'Alice', { mutate: true })) // { name: 'Alice' }
console.log(target) // { name: 'Alice' }Methods: get(),
list(),
iterate()
Type: boolean
Default: false
By default, properties' values are returned.
When true, objects with the following shape are returned instead:
valueany: property's valuepathPath: property's full pathmissingboolean: whether the property is missing from the target
const target = { firstName: 'Alice', lastName: 'Smith' }
list(target, '*') // ['Alice', 'Smith']
list(target, '*', { entries: true })
// [
// { value: 'Alice', path: ['firstName'], missing: false },
// { value: 'Smith', path: ['lastName'], missing: false },
// ]Methods: all except has() and
remove()
Type: boolean
Default: false with list|iterate(), true with set()
When false, properties not defined in the target are
ignored.
const target = {}
set(target, 'name', 'Alice') // { name: 'Alice' }
set(target, 'name', 'Alice', { missing: false }) // {}
list(target, 'name') // []
list(target, 'name', { missing: true, entries: true })
// [{ value: undefined, path: ['name'], missing: true }]Methods: get(),
list(),
iterate()
Type: boolean
Default: false
When returning sibling object properties, sort them by the lexigographic order of their names (not values).
const target = { lastName: 'Doe', firstName: 'John' }
list(target, '*') // ['Doe', 'John']
list(target, '*', { sort: true }) // ['John', 'Doe']Methods: get(),
list(),
iterate()
Type: boolean
Default: false
When using unions or deep wildcards, a query might match both a property and some of its children.
This option decides whether the returned properties should be sorted from children to parents, or the reverse.
const target = { user: { name: 'Alice' } }
list(target, 'user.**') // [{ name: 'Alice' }, 'Alice']
list(target, 'user.**', { childFirst: true }) // ['Alice', { name: 'Alice' }]Methods: all except has()
Type: boolean
Default: false
When using unions or deep wildcards, a query might match both a property and some of its children.
When true, only leaves are matched. In other words, a matching property is
ignored if one of its children also matches.
const target = { user: { name: 'Alice' } }
list(target, 'user.**') // [{ name: 'Alice' }, 'Alice']
list(target, 'user.**', { leaves: true }) // ['Alice']Methods: get(),
list(),
iterate()
Type: boolean
Default: false
When using unions or deep wildcards, a query might match both a property and some of its children.
When true, only roots are matched. In other words, a matching property is
ignored if one of its parents also matches.
const target = { user: { name: 'Alice' } }
list(target, 'user.**') // [{ name: 'Alice' }, 'Alice']
list(target, 'user.**', { roots: true }) // [{ name: 'Alice' }]Methods: all
Type: boolean
Default: false
If true, wildcards do not recurse on arrays. Array items can
still be matched by using indices or
slices.
const target = [{ name: 'Alice' }, { name: 'Bob' }]
list(target, '**')
// [
// [{ name: 'Alice' }, { name: 'Bob' }],
// { name: 'Alice' },
// 'Alice',
// { name: 'Bob' },
// 'Bob',
// ]
list(target, '**', { shallowArrays: true })
// [
// [{ name: 'Alice' }, { name: 'Bob' }],
// ]Methods: all
Type: boolean
Default: false
Unless true, wildcards and regexps ignore
properties of objects that are not plain objects (like class instances, errors
or functions). Those can still be matched by using their
property name.
const target = { user: new User({ name: 'Alice' }) }
list(target, 'user.*') // []
list(target, 'user.*', { classes: true }) // ['Alice']Methods: all
Type: boolean
Default: false
By default, wildcards and regexps ignore properties that are either inherited or not enumerable. Those can still be matched by using their property name.
When true, inherited properties are not ignored, but not enumerable ones still
are.
wild-wild-utils: functional utilities usingwild-wild-path's object property pathswild-wild-parser: parser forwild-wild-path's object property paths
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