index.js

'use strict';

var isNegativeInteger = require( './../lib' );

console.log( isNegativeInteger( -5.0 ) );
// returns true

console.log( isNegativeInteger( new Number( -5.0 ) ) );
// returns true

console.log( isNegativeInteger( 0.0 ) );
// returns false

console.log( isNegativeInteger( -3.14 ) );
// returns false

console.log( isNegativeInteger( 5.0 ) );
// returns false

console.log( isNegativeInteger( '-5' ) );
// returns false

console.log( isNegativeInteger( null ) );
// returns false