object

☰std/object/any

Checks if the given object is present and it is not empty (contains at least one entry).

Type signature

(xs?: object) => boolean

Examples

any({ a: 1, b: 2, c: 3 });
// ⇒ true

Try in REPL

any({});
// ⇒ false

Try in REPL

any(null);
// ⇒ false

Try in REPL

any(undefined);
// ⇒ false

Try in REPL

Questions

How to check if an object is not empty?
How to check if an object contains some values?
How to check if an object is not null or undefined?

TypeScript source • JavaScript source

☰std/object/apply

Applies the given parameters to the given dictionary of functions.

Type signature

(
  fs: ((...xs: any[]) => any)[]
) => (...xs: any[]) => object

Examples

const lower = (text) =>
  text.toLowerCase();
const upper = (text) =>
  text.toUpperCase();

apply({ lower, upper })("TeSt");
// ⇒ { lower: "test", upper: "TEST" }

Try in REPL

Questions

How to apply a value over an object of functions?

TypeScript source • JavaScript source

☰std/object/empty

Empty object.

Type signature

{}

Examples

empty;
// ⇒ {}

Try in REPL

Questions

How to get an empty object?

TypeScript source • JavaScript source

☰std/object/entries

Lists key-value pairs (entries) present in the given object.

Type signature

{
  <T>(
    o:
      | {
          [s: string]: T;
        }
      | ArrayLike<T>
  ): [string, T][];
  (o: {}): [string, any][];
}

Examples

entries({ a: 1, b: 2, c: 3 });
// ⇒ [["a", 1], ["b", 2], ["c", 3]]

Try in REPL

Questions

How to get entries of an object?
How to get an array of key-value pairs of an object?

TypeScript source • JavaScript source

☰std/object/enumerable

Creates a 1 to 1 mapping of the given values as an object.

Type signature

(...xs: string[]) => object

Examples

enumerable("TEST", "X", "Y");
// ⇒ { TEST: 'TEST', X: 'X', Y: 'Y' }

Try in REPL

Questions

How to create an object of the same keys and values?

TypeScript source • JavaScript source

☰std/object/equals

Checks if two objects are deeply equal.

Type signature

(a: any, b: any) => boolean

Examples

equals({ a: 1 }, { a: 1 });
// ⇒ true

Try in REPL

equals(
  { b: [1, 2] },
  { b: [1, 2] }
);
// ⇒ true

Try in REPL

Questions

How to check if two objects are equal?
How to check deep object equality?

TypeScript source • JavaScript source

☰std/object/every

Test if every element passes the given predicate.

Type signature

(
  f: (value: any, key: string, context: object) => boolean
) => (xs: object) => boolean

Examples

every((x) => x >= 0)({
  x: 5,
  y: 3,
  z: 0,
});
// ⇒ true

Try in REPL

every((x) => x > 0)({
  x: 5,
  y: 3,
  z: 0,
});
// ⇒ false

Try in REPL

Questions

How to check if every entry in an object passes a given predicate?

TypeScript source • JavaScript source

☰std/object/filter

Filters the given object with the given predicate.

Type signature

(
  f: (value: any, key: string, context: object) => boolean
) => (xs: object) => object

Examples

filter((x) => x % 2 !== 0)({
  a: 1,
  b: 2,
  c: 3,
});
// ⇒ { a: 1, c: 3 }

Try in REPL

Questions

How to filter an object?

TypeScript source • JavaScript source

☰std/object/find

Searches the given object by the given predicate and returns the found value or undefined.

Type signature

(
  predicate: (value: any, key: string, context: object) => boolean
) => (xs: object) => any

Examples

find(({ x }) => x % 2 === 0)({
  a: { x: 1 },
  b: { x: 2 },
  c: { x: 3 },
});
// ⇒ { x: 2 }

Try in REPL

Questions

How to find the value of an object by a predicate function?

TypeScript source • JavaScript source

☰std/object/findEntry

Searches the given object by the given predicate and returns the found entry or undefined.

Type signature

(
  predicate: (value: any, key: string, context: object) => boolean
) => (xs: object) => any

Examples

findEntry(({ x }) => x % 2 === 0)({
  a: { x: 1 },
  b: { x: 2 },
  c: { x: 3 },
});
// ⇒ ["b", { x: 2 }]

Try in REPL

Questions

How to find an entry of an object by a predicate function?

TypeScript source • JavaScript source

☰std/object/findKey

Searches the given object by the given predicate and returns the found key or undefined.

Type signature

(
  predicate: (value: any, key: string, context: object) => boolean
) => (xs: object) => any

Examples

findKey(({ x }) => x % 2 === 0)({
  a: { x: 1 },
  b: { x: 2 },
  c: { x: 3 },
});
// ⇒ "b"

Try in REPL

Questions

How to find a key of an object by a predicate function?

TypeScript source • JavaScript source

☰std/object/first

Returns the first value in the given object. Follows the default object iteration order.

Type signature

(xs: object) => any

Examples

first({ a: 1, b: 2, c: 3 });
// ⇒ 1

Try in REPL

Questions

How to get the first value of an object?

TypeScript source • JavaScript source

☰std/object/flatMapValues

Flat maps the values of the given object.

Type signature

(
  f: (value: any, key: string, context: object) => any
) => (xs: object) => any[]

Examples

flatMapValues((x) => [x, x * 2])({
  a: 1,
  b: 2,
  c: 3,
});
// ⇒ [1, 2, 2, 4, 3, 6]

Try in REPL

Questions

How to flat map an object?

TypeScript source • JavaScript source

☰std/object/fromEntries

Creates an object from an array of key-value pairs (entries).

Type signature

(entries: [string, any][]) => object

Examples

fromEntries([
  ["a", 1],
  ["b", 2],
  ["c", 3],
]);
// ⇒ { a: 1, b: 2, c: 3 }

Try in REPL

Questions

How to create an object from an array of key-value pairs?
How to create an object from an array of entries?

TypeScript source • JavaScript source

☰std/object/groupBy

Groups the given array of values by the given key selector.

Type signature

(selector: (x: any) => string) => (xs: any[]) => object

Examples

groupBy((x) =>
  x % 2 == 0 ? "even" : "odd"
)([1, 2, 3, 4, 5, 6, 7]);
// ⇒ { even: [2, 4, 6], odd: [1, 3, 5, 7] }

Try in REPL

Questions

How to group an array by a key function?

TypeScript source • JavaScript source

☰std/object/hasKey

Checks if the given key is present in the object.

Type signature

(key: string) => (xs?: any) => any

Examples

hasKey("c")({ a: 1, b: 2, c: 3 });
// ⇒ true

Try in REPL

Questions

How to check if an object contains a given key?

TypeScript source • JavaScript source

☰std/object/length

Returns the number of entries within the given object.

Type signature

(xs: object) => number

Examples

length({ a: 1, b: 2, c: 3 });
// ⇒ 3

Try in REPL

Questions

How to check how many entries are in an object?

TypeScript source • JavaScript source

☰std/object/map

Maps the given object with the given function.

Type signature

(
  f: (value: any, key: string, context: object) => any
) => (xs: object) => object

Examples

map((x) => x ** 2)({
  a: 1,
  b: 2,
  c: 3,
});
// ⇒ { a: 1, b: 4, c: 9 }

Try in REPL

Questions

How to map an object?
How to transform an object?

TypeScript source • JavaScript source

☰std/object/mapEntries

Maps entries of the given object.

Type signature

(
  f: (value: any, key: string, context: object) => any
) => (xs: object) => [string, any][]

Examples

mapEntries((x) => x ** 2)({
  a: 1,
  b: 2,
  c: 3,
});
// ⇒ [["a", 1], ["b", 4], ["c", 9]]

Try in REPL

Questions

How to map object entries?

TypeScript source • JavaScript source

☰std/object/mapKeys

Transforms the object keys with the given function.

Type signature

(
  f: (value: any, key: string, context: object) => any
) => (xs: object) => object

Examples

mapKeys((_, key) =>
  key.toUpperCase()
)({ a: 1, b: 2, c: 3 });
// ⇒ { A: 1, B: 2, C: 3 }

Try in REPL

Questions

How to map object keys?
How to transform object keys?

TypeScript source • JavaScript source

☰std/object/mapValues

Maps and returns an array of transformed object values.

Type signature

(
  f: (value: any, key: string, context: object) => any
) => (xs: object) => any[]

Examples

mapValues((x) => x ** 2)({
  a: 1,
  b: 2,
  c: 3,
});
// ⇒ [1, 4, 9]

Try in REPL

Questions

How to map object values?

TypeScript source • JavaScript source

☰std/object/merge

Merges two objects deeply.

Type signature

(
  a: {
    [index: string]: any;
  },
  b: object
) => object

Examples

merge({ a: 1, b: 3 }, {});
// ⇒ { a: 1, b: 3 }

Try in REPL

merge({ a: 1, b: 3 }, { b: 7 });
// ⇒ { a: 1, b: 7 }

Try in REPL

merge(
  { a: 1, b: 3 },
  { b: { d: 8 } }
);
// ⇒ { a: 1, b: { d: 8 } }

Try in REPL

merge(
  { a: 1, b: { c: 3 } },
  { b: { d: 8 } }
);
// ⇒ { a: 1, b: { c: 3, d: 8 } }

Try in REPL

Questions

How to merge two objects together?
How to deeply merge two objects?

TypeScript source • JavaScript source

☰std/object/none

Checks if the given object is empty.

Type signature

(xs?: object) => boolean

Examples

none({});
// ⇒ true

Try in REPL

none(null);
// ⇒ true

Try in REPL

none({ a: 1 });
// ⇒ false

Try in REPL

Questions

How to check if an object is empty?
How to check if an object is null or undefined?

TypeScript source • JavaScript source

☰std/object/some

Test if any element passes the given predicate.

Type signature

(
  f: (value: any, key: string, context: object) => boolean
) => (xs: object) => boolean

Examples

some((x) => x >= 4)({
  x: 5,
  y: 3,
  z: 0,
});
// ⇒ true

Try in REPL

some((x) => x < 0)({
  x: 5,
  y: 3,
  z: 0,
});
// ⇒ false

Try in REPL

Questions

How to check if any entry in an object passes a given predicate?

TypeScript source • JavaScript source

☰std/object/sort

Sorts the given object by a comparator.

Type signature

(
  f: (a: any, b: any) => number
) => (xs: object) => object

Examples

sort({
  a: 3,
  b: 2,
  c: 3,
  d: -7,
  e: 13,
  f: 0,
  g: 8,
});
// ⇒ {"d": -7,"f": 0,"b": 2,"a": 3,"c": 3,"g": 8,"e": 13}

Try in REPL

Questions

How to sort an object?

TypeScript source • JavaScript source