Usage

var isMethodIn = require( '@stdlib/assert/is-method-in' );

isMethodIn( value, property )

Returns a boolean indicating if a value has a specified method name, either own or inherited.

var value = {
    'beep': 'boop'
};

var bool = isMethodIn( value, 'toString' );
// returns true

bool = isMethodIn( value, 'beep' );
// returns false

bool = isMethodIn( value, 'bap' );
// returns false

Notes

• The function does not throw when provided null or undefined. Instead, the function returns false.

  var bool = isMethodIn( null, 'toString' );
  // returns false
  
  bool = isMethodIn( void 0, 'toString' );
  // returns false

• Value arguments other than null or undefined are coerced to objects.

  var bool = isMethodIn( 'beep', 'toString' );
  // returns true

• Non-symbol property arguments are coerced to strings.

  function noop() {
      // Example function...
  }
  
  var value = {
      'null': noop
  };
  var bool = isMethodIn( value, null );
  // returns true
  
  value = {
      '[object Object]': noop
  };
  bool = isMethodIn( value, {} );
  // returns true

Examples

var isMethodIn = require( '@stdlib/assert/is-method-in' );

var bool = isMethodIn( {}, 'toString' );
// returns true

bool = isMethodIn( { 'a': 'b' }, 'a' );
// returns false

bool = isMethodIn( { 'a': 'b' }, 'c' );
// returns false

bool = isMethodIn( { 'a': 'b' }, null );
// returns false

bool = isMethodIn( null, 'a' );
// returns false

bool = isMethodIn( void 0, 'a' );
// returns false

bool = isMethodIn( { 'null': isMethodIn }, null );
// returns true

bool = isMethodIn( { '[object Object]': isMethodIn }, {} );
// returns true

See Also

• @stdlib/assert/has-property: test if an object has a specified property, either own or inherited.
• @stdlib/assert/is-function: test if a value is a function.
• @stdlib/assert/is-method: test if an object has a specified method name.