How to use filter function in javascript? Best 5 example of filter function in js.

Hey Everyone .

Filter Function :

the basic use of this function is to get details of record from Array according to some properties. The filter function is very helpful with JSON Array.

Syntax : arrayname.filter((user define variable name)=>{return condition});

Lets understand this with basic examples :

Q1. how to get all employees with gender male ?

    

 var employee_list=[
 {'id':'1','name':'Mukund Singh','gender':'M'},
{'id':'2','name':'Arun','gender':'M'},
{'id':'3','name':'Chanu','gender':'F'},
{'id':'4','name':'Main','gender':F'}
                                    ]

console.log(employee_list.filter((v)=>{return v.gender=='M'}));

Here you will result :

[{'id':'1','name':'Mukund Singh','gender':'M'},
{'id':'2','name':'Arun','gender':'M'}]

Q2. how to get all products with active status  true ?

var product_list=[
 {'id':'1','name':'Apple','is_active':true},
{'id':'2','name':'Pizza','is_active':false},
{'id':'3','name':'Milk','is_active':false},
{'id':'4','name':'Orange','is_active':true}
                                    ]
console.log(product_list.filter((v)=>{return v.is_active}));
Here you will result :

[{'id':'1','name':'Apple','is_active':true},
{'id':'4','name':'Orange','is_active':true}]

Q3. how to get all products with MRP more than 100 ?

var product_list=[
 {'id':'1','name':'Apple','mrp':20},
{'id':'2','name':'Pizza','mrp':1001},
{'id':'3','name':'Milk','mrp':200},
{'id':'4','name':'Orange','mrp':-40}
                                    ]
console.log(product_list.filter((v)=>{return v.mrp>100}));
Here you will result :

[ {'id':'2','name':'Pizza','mrp':1001},
{'id':'3','name':'Milk','mrp':200}]

Q4. how to get all products with MRP more than 100 and active status true?

var product_list=[
 {'id':'1','name':'Apple','mrp':20,'is_active':true},
{'id':'2','name':'Pizza','mrp':1001,'is_active':true},
{'id':'3','name':'Milk','mrp':200,'is_active':false},
{'id':'4','name':'Orange','mrp':-40,'is_active':true}
                                    ]
console.log(product_list.filter((v)=>{return v.mrp>100 && v.is_active}));
Here you will result :

[ {'id':'2','name':'Pizza','mrp':1001,'is_active':true}]

Q5. how to get all products with MRP more than 100 or active status true?

var product_list=[
 {'id':'1','name':'Apple','mrp':20,'is_active':false},
{'id':'2','name':'Pizza','mrp':1001,'is_active':true},
{'id':'3','name':'Milk','mrp':200,'is_active':false},
{'id':'4','name':'Orange','mrp':-40,'is_active':true}
                                    ]
console.log(product_list.filter((v)=>{return v.mrp>100 || v.is_active}));
Here you will result :

[ {'id':'2','name':'Pizza','mrp':1001,'is_active':true},
{'id':'3','name':'Milk','mrp':200,'is_active':false},
{'id':'4','name':'Orange','mrp':-40,'is_active':true}]