README.md

noneOwnBy

Tests whether every own property of an object fails a test implemented by a predicate function.

Usage

var noneOwnBy = require( '@stdlib/object/none-own-by' );

noneOwnBy( object, predicate[, thisArg ] )

Tests whether every own property of an object fails a test implemented by a predicate function.

function isUnderage( age ) {
    return ( age < 18 );
}

var obj = {
    'a': 28,
    'b': 22,
    'c': 25
};

var bool = noneOwnBy( obj, isUnderage );
// returns true

If a predicate function returns a truthy value, the function immediately returns false.

function isUnderage( age ) {
    return ( age < 18 );
}

var obj = {
    'a': 12,
    'b': 22,
    'c': 25
};

var bool = noneOwnBy( obj, isUnderage );
// returns false

Notes

• If the 1st argument is not an object or the second argument is not a function, the function throws a Type Error.

• If provided an empty object, the function returns true.

  function truthy() {
      return true;
  }
  var bool = noneOwnBy( {}, truthy );
  // returns true

Examples

var noneOwnBy = require( '@stdlib/object/none-own-by' );

function isUnderage( age ) {
    return age < 18;
}

var obj = {
    'a': 26,
    'b': 20,
    'c': 25
};

var bool = noneOwnBy( obj, isUnderage );
// returns true

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See Also

• @stdlib/object/any-own-by: test whether whether any 'own' property of a provided object satisfies a predicate function.
• @stdlib/object/every-own-by: test whether all own properties of an object pass a test implemented by a predicate function.
• @stdlib/utils/none-by: test whether all elements in a collection fail a test implemented by a predicate function.
• @stdlib/object/some-own-by: test whether some own properties of a provided object satisfy a predicate function for at least n properties.