auxiliary-js

Auxiliary JS : a utility library

Installation:

npm install auxiliary-js

Usage:

var util=require('util');

1. Each(): to iterate through an array or object

    var list=[1,2,3];  // var list={"one":1,"two":2,"three":3};
    
    util.each(list,function(val){
        console.log(val);
    });

1. Map(): to modify values of an object or array and return it.

    var list=[1,2,3];

    util.map(list,functio(val){
        return val*2;
    });

1. First() and Last() to get the first and last element from the list respectively.

    var first=util.map([1,2,3]);
    var last=util.map([1,2,3]);

1. Find(): returns the first matching elements from the array

    var list=[1,2,3,4,5,6];
    var result=util.find(list,function(val){
        return val%2==0;
    });  //returns 2

1. Filter(): returns all matching elements from the array

    var list=[1,2,3,4,5,6];
    var result=util.filter(list,function(val){
        return val%2==0;
    });  //returns [2,4,6]

1. Except(): returns all the non matching elements from the array

    var list=[1,2,3,4,5,6];
    var result=util.excpt(list,function(val){
        return val%2==0;
    });  //returns [1,3,5]

1. All(): returns true if all the elements match the given criteria

    var list=[2,4,6];
   var result = util.all(list, function (val) {
                return val % 2 == 0;
            });  //returns true;

1. Any(): returns true if any of the elements match the given criteria

    var list=[2,4,6];
    var result = util.any(list, function (val) {
                return val % 2 == 0;
   });  //returns true;

1. Min() and Max(): returns min and max value from array respectively

    var list=[2,4,6,-2];
    var min = util.min(list); //returns -2;
    var max = util.max(list); //returns 6;

1. Sort(): to sort collections

     var list = [2, 5, 1, 10, 8, 7];
     var result = util.sortBy(list); 
     
     var list = [
                { id: 2, name: "abc", price: 100 },
                { id: 5, name: "ghi", price: 200 },
                { id: 1, name: "def", price: 300 }
            ];
     var result = util.sort(list, "id"); //sorting by id field

1. SortByDesc(): to sort collections in descending order

     var list = [2, 5, 1, 10, 8, 7];
     var result = util.sortByDesc(list); 
     
     var list = [
                { id: 2, name: "abc", price: 100 },
                { id: 5, name: "ghi", price: 200 },
                { id: 1, name: "def", price: 300 }
            ];
     var result = util.sortByDesc(list, "id"); //sorting by id field

1. Count(): to get the count of the elements satisfying the criteria

     var list = [2, 5, 1, 10, 8, 7];
     var result = util.count(list,function(val){
         return val%2==0;
     }); //returns 3
     

1. CountBy(): to get the count of the elements by their types

    var list = [2, 3, 4, 5, 6, 7, 0, 0, 8, 0];

    var result = util.countBy(list, function (val) {
        if (val == 0) return 'zero';
        if (val % 2 == 0) return 'even';
        return 'odd';
    });

   /*
   returns 
   {
        zero: 3,
        even: 4,
        odd: 3
    }
    */