rewriting-lodash-functions

The Silly Tortoise Function Hub

This is a library of commonly used JavaScript/JQuery/Lodash/Underscore methods with documentation and commenting using ES2015. This library is avaiable as an npm moodule for your enjoyment.

Why do you want our library?

• you will learn JavaScript easily
• you should use us with ES2015
• your job will be so much easier

Specifications

Required

• [ ] Includes a list of commonly used methods to rewrite in ES2015.
• [ ] Includes a README that describes each method and provides an example of use.
• [ ] Package is published with NPM.
• [ ] Includes tests for all methods described.
• [ ] This library includes 10 amazing easy to use functions.
• [ ] The artifact produced is properly licensed, preferably with the [MIT license][mit-license].

The Silly Tortoise Function Hub

This is a library of commonly used JavaScript/JQuery/Lodash/Underscore methods. This library is avaiable as an npm moodule for your enjoyment.

Why do you want our library?

• you will learn JavaScript easily
• you should use us with ES2015
• your job will be so much easier

Methods

Add

Adds two numbers

add(num1, num2)

add(6, 4);
// is 10

Chunk

Creates an array of elements split into groups the length of size. If array can't be split evenly, the final chunk will contain a remainder.

chunk(array, [size=1])

chunk(['a', 'b', 'c', 'd'], 2);
// is [['a', 'b'], ['c', 'd']]

chunk(['a', 'b', 'c', 'd'], 3);
// is [['a', 'b', 'c'], ['d']]

Compact

Creates an array with all falsey values removed.

compact([0, 1, false, 2, '', 3]);
// is [1, 2, 3]

Filter

Iterates over elements of collection, returning an array of all elements predicate returns truthy for. The predicate is invoked with three arguments: (value, index|key, collection).

filter(collection, [predicate=_.identity])

var users = [
  { 'user': 'barney', 'age': 36, 'active': true },
  { 'user': 'fred',   'age': 40, 'active': false }
];

filter(users, function(o) { return !o.active; });
// is objects for ['fred']

// The `_.matches` iteratee shorthand.
filter(users, { 'age': 36, 'active': true });
// is objects for ['barney']

// The `_.matchesProperty` iteratee shorthand.
filter(users, ['active', false]);
// is objects for ['fred']

// The `_.property` iteratee shorthand.
filter(users, 'active');
// is objects for ['barney']

Flow Right

It creates a function that invokes the given functions from right to left.

flowRight([funcs])

function square(n) {
  return n * n;
}

var addSquare = flowRight([square, add]);
addSquare(1, 2);
// is 9

isFunction

Checks if value is classified as a Function object.

isFunction(value)

isFunction(_);
// is true

 isFunction(/abc/);
// is false

Last

Gets the last element of array.

last(array)

last([1, 2, 3]);
// is 3

nth

Gets the element at index n of array. If n is negative, the nth element from the end is returned.

nth(array, [n=0])

var array = ['a', 'b', 'c', 'd'];

nth(array, 1);
// is 'b'

nth(array, -2);
// is 'c';

Reverse

Reverses array so that the first element becomes the last, the second element becomes the second to last, and so on.

reverse(array)

var array = [1, 2, 3];

reverse(array);
// is [3, 2, 1]

console.log(array);
// is [3, 2, 1]

Slice

Creates a slice of array from start up to, but not including, end.

slice(array, [start=0], [end=array.length])

Subtract

Subtract two numbers.

subtract(minuend, subtrahend)

subtract(6, 4);
// is 2

Tail

Gets all but the first element of array.

tail(array)

tail([1, 2, 3]);
// is [2, 3]

Times

Invokes the iteratee n times, returning an array of the results of each invocation. The iteratee is invoked with one argument; (index).

times(n, [iteratee=_.identity])

times(3, String);
// is ['0', '1', '2']

 times(4, _.constant(0));
// is [0, 0, 0, 0]

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