_.pullAllBy(array, values, [iteratee=_.identity]) source npm package This method is like _.pullAll except that it accepts iteratee which is invoked for each element of array and values to generate the criterion by which they're compared. The iteratee is invoked with one argument: (value).Note: Unlike _.differenceBy, this method mutates array. Since 4.0.0 Arguments array (Array): The array to modify. values (Array): The values to remove. [iteratee=_.identity] (Function): The iteratee invoke

_.isNull(value) source npm package Checks if value is null. Since 0.1.0 Arguments value (*): The value to check. Returns (boolean): Returns true if value is null, else false. Example _.isNull(null); // => true   _.isNull(void 0); // => false

_.subtract(minuend, subtrahend) source npm package Subtract two numbers. Since 4.0.0 Arguments minuend (number): The first number in a subtraction. subtrahend (number): The second number in a subtraction. Returns (number): Returns the difference. Example _.subtract(6, 4); // => 2

_.pickBy(object, [predicate=_.identity]) source npm package Creates an object composed of the object properties predicate returns truthy for. The predicate is invoked with two arguments: (value, key). Since 4.0.0 Arguments object (Object): The source object. [predicate=_.identity] (Function): The function invoked per property. Returns (Object): Returns the new object. Example var object = { 'a': 1, 'b': '2', 'c': 3 };   _.pickBy(object, _.isNumber); // => { 'a': 1, 'c': 3 }

_.divide(dividend, divisor) source npm package Divide two numbers. Since 4.7.0 Arguments dividend (number): The first number in a division. divisor (number): The second number in a division. Returns (number): Returns the quotient. Example _.divide(6, 4); // => 1.5