Useful Javascript Methods | Javascript method to count the specific char in string

Program:

//method definition

function countString(str, chr){

     var count = 0;

     for(var k=0; k < str.length; k++){

         if(str.charAt(k) === chr){

             count++;

         }

    }

    return count;

}

//method call

countString("Hello World", "l");

Output:

3

To The New React JS Interview Questions | TTN React Interview Questions | Tp The New UI Interview Questions | JS Interview Questions

 Qus 1.  Given a string "Hello" & write a code to print the count of the chars available to it & create the object like this

{"H":1, "e":1, "l":2, "o":1}

Soln:  

var word = "Hello";

temp = [];

arr.forEach(function(chr){

        temp[chr] = word.split(chr).length - 1;

});

var finalObj = Object.assign({}, temp);

console.log(finalObj);

 Qus 2.  Output of the below given program -

Program:

console.log(1);

console.log(2);

setTimeout(()=>{

console.log(3);

}, 3000);

console.log(4);

console.log(5);

Output:

1

2

4

5

3

 Qus 3.  Output of the below given program & what if replaces the inner function as a arrow method -

Program: 

var personObj = {

    first_name: 'Alex',

    last_name: 'Waugh',

    getName: function(){

        console.log( this.first_name, this.last_name)

    }

}

personObj.getName();

Output:

Alex Waugh

//if replaced the getName to arrow method then what will be the output

undefined undefined