Array of Lodash--javascript Library

these days and learned a lot of the original knowledge, in the weekend summed up some JavaScript library-lodash (Array) of the content, I hope in the future learning from time to review and update themselves.

The lodash-JavaScript Tool Library is very popular today, and here is a summary of some of the code I have for it :

1._.chunk refers to the element that merges an array by the specified length .

  _.chunk ([ ' A ' ' B ' Span style= "LINE-HEIGHT:21.6000003814697PX; Background-color:rgb (255, 255, 255); " >,  ' d '  

//→[[' A ', ' B '], [' C ', ' d ']

_.chunk ([' a ', ' B ', ' C ', ' d '], 3);

//→[[' A ', ' B ', ' C '], [' d ']]  

2._. Compact removes spurious values from array elements.

_.compact ([0, 1, false, 2, ', 3]);

//→[1, 2, 3]

The 3._.drop can output the element that deletes the specified position (the default value is 1), or 0 to return the original array .

_.drop ([1, 2, 3]);

//→[2, 3]

_.drop ([1, 2, 3], 2);

//→[3]

_.drop ([1, 2, 3], 5);

//→[]

_.drop ([1, 2, 3], 0);

//→[1, 2, 3] //This is the return of the original array.

4. _.difference deletes the same element as the second array in the first array element .

_.difference ([1, 2, 3], [5, 2, 10]);

//→[1, 3]

The 5._.intersetion is then output by locating the elements in several arrays .

_.intersection ([1, 2, 3], [5, 2, 1, 4], [2, 1]);

//→[1, 2]

6._.dropright I myself think this is the same as the basic usage of _.drop, except that this is removed from the right.

The 7._.findindex can output the opposite number of satisfied condition objects.

varUsers = [{' user ':' Barney ',' age ': 36,' Active ':false},  {' user ':' Fred ',' age ': 40,' Active ':true},                                                      {' user ':' Pebbles ',' age ': 1,' Active ':false}  ];

        function return

//→0

_.findindex (Users, { ' age ': 1});

//→2

8. (1.) _.first outputs the first element .

_.first ([1, 2, 3]);

//→1

_.first ([]);

//→undefined  

(2.)_.rest outputs the remainder of the element except the first one .

_.rest ([1, 2, 3]);

//→[2, 3]  

(3) _.last Output last element

_.last ([1, 2, 3]);

//→3

(4.)_.initial outputs the remaining elements in addition to the last element

_.initial ([1, 2, 3]);

//→[1, 2]

9. delete the original array 2, 3 after the output.

var array = [1, 2, 3, 1, 2, 3];

_.pull (Array, 2, 3);

Console.log (array);

//→[1, 1]

Ten._.without remove the elements from the array.

. Without ([1, 2, 1, 0, 3, 1, 4], 0, 1);

//→[2, 3, 4]

Array of Lodash--javascript Library