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isEqual()

const isEqual: (a) => (b) => boolean = equality

Creates a predicate function that determines if a value is strictly equal to a reference value.

Logical Equality (XNOR) (a === b).

Parameters​

a​

unknown

The first value to compare.

Returns​

(b): boolean

Parameters​

b​

unknown

Returns​

boolean

See​

Remarks​

pure function

Example​

equality(4)(8);
// false

Param​

The reference value to compare against

Param​

The value to test

Remarks​

  • Pure function with no side effects
  • Uses strict equality (===) comparison
  • Useful for array filtering and functional programming

Example​

const isZero = isEqual(0);
isZero(0);   // true
isZero('0'); // false (strict equality)

const isFoo = isEqual('foo');
isFoo('foo'); // true
isFoo('bar'); // false

// Useful with arrays
const numbers = [1, 2, 3, 2, 4];
const twos = numbers.filter(isEqual(2)); // [2, 2]