3 notes.txt

Contents:  

1.Javascript Looping
2.Math Methods
3.Date Methods

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===>for Loop

*It loops fixed execution. 
*that means know the starting and end point for loop is used. 
*Two or more values printed used to for loop.
*The output is vertical mode i.e one by one.

*syntax:
  for(initialization; condition; increment/decrement)
  {
    //block of code 
  }

*Example:
for (var a=1;a<=10;a++)
{
   console.log(a);
}                            // 1 2 3 4 5 6 7 8 9 10 (vertical mode)

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===>While Loop

*It loops through a block of code as long as the specified condition is true.
*The line continues to execute untill the condition is true. 

*Syntax:
  while(condition)
  {
    //block of code (code will execute until condition is true)
  }

*Examples:
   var countdown = 5;
   var i =0;
   while(i < countdown)
   {
    console.log(countdown);
    countdown--;
   }                         // 5 4 3 2 1 (vertical mode)

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=>Do-While Loop

*It will execute the body first then checks the condition satisfies or not.
*First print and checks the condition.
*If the condition first becomes fail then exit the loop immediately.

*Syntax:
   do{
    //block of code
   }while(condition)

Example:
   let count =0;
   do{
    console.log(count);
    count ++;
   }while(count<5)          // 1 2 3 4 (vertical mode)


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===>if-else

*It's nick name "conditional statement".
*check the Two or more conditions.
*syntax:
  if(condition)
  {
    //block of codes
  }

  else(condition)
  {
    //block of codes
  }

*Example:
var a=15;
if(a%2 == 0
{
   console.log("EVEN");
}
else
{
   console.log("ODD");
}                        //ODD

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...Javascript Math Methods...

=>Math.floor(Lowest or Base Value)
console.log(Math.floor(5.9));//5
console.log(Math.floor(-4.9));//-5****

=>Math.ceil(Highest Value)
console.log(Math.ceil(5.1));//6
console.log(Math.ceil(-4.9));//-4****(put the negative input and print the output is lowest value)

=>Math.round(Round Off the Value)
console.log(Math.round(5.4));//5
console.log(Math.round(6.6));//7

=>Math.sqrt(The value squared)
console.log(Math.sqrt(0));//0
console.log(Math.sqrt(-2));//****Not A number****       
console.log(Math.sqrt(25));//5

=>Math.cbrt(The value cubed)
console.log(Math.cbrt(27));//3
console.log(Math.cbrt(125));//5
console.log(Math.cbrt(-125));//-5****(Given the negative input and print the output is negative)  )

==>Math.abs(Negative Value not considered then changed the positive Integer)
console.log(Math.abs(-4.5));//4.5
console.log(Math.abs(-4.8));//4.8
console.log(Math.abs(-4.4));//4.4

==>Math.trunc(Removed the decimal points and print the Integer value)
console.log(Math.trunc(6.5));//6
console.log(Math.trunc(5.8));//5
console.log(Math.trunc(4.4));//4

==>Math.min(Print the minimum value)
console.log(Math.min(3,25,49,-3.28));//-3.28****

==>Math.max(Print the maximum value)
console.log(Math.max(3,25,49,3.28));//49

==>Math.pow
console.log(Math.pow(2,5));//2*2*2*2*2

==>Math.random(Generates a random number from 0 to 9 with decimals)
console.log(Math.random()*10)//OTP is a good examples

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Date Methods

what is date methods? : New Date() creates a date object with current date and time.

==>toDateString() :- Returns the date portion of the date object
const a = new Date();//date object
console.log(a.toDateString());

==>getDate() : Returns the day of the month(1 to 31) of a date.
const b = new Date();//date object
console.log(b.getDate());

==>getFullYear() : Return the full year (4 digits) of a date.
const c = new Date();//date object
console.log(c.getFullYear());

==>getMonth() : Return the month(0 to 11)of a date.
const d = new Date();//date object
console.log(d.getMonth());

==>getDay() :-Return the day of the week(0to6) of a date.  

==>getHours():- return the hours(0 to 23)of a date.

==>getMinutes():- return the minutes(0 to 59)of a date.

==>getSeconds():- return the seconds(0 to 59) of a date.

==>getMilliseconds() :- return the milliseconds(0 to 999) of a date.

==>getTime() :- return the number of milliseconds since jan 1

const e = new Date();
console.log(e.getDay());
console.log(e.getHours());
console.log(e.getMinutes());
console.log(e.getSeconds());
console.log(e.getMilliseconds());
console.log(e.getTime());


Date set methods:

===>setDate():- sets the day of the month of a date.

===>setFullYear() :- sets the full year of a date and also sets month and day.

===>setHours() :- sets the hours of a date also sets minutes , seconds and milliseconds.

===>setMilliseconds() :-  sets the milliseconds of a date.

===>setMinutes() :-  sets minutes of a date also sets seconds and milliseconds.

===>setSeconds() :- sets seconds of a date also sets milliseconds.

===>setMonth() :- sets the month of a date also sets day of the month.

===>setTime() :- sets a date and time by adding or subtracting a specified number od milliseconds(to/from mid of jan 1 1990)

const f = new Date();
f.setDate(27);
console.log(f);
f.setFullYear(2020,5,26);
console.log(f);
f.setHours(11);
console.log(f);
f.setMinutes(45);
console.log(f);
f.setSeconds(55);
console.log(f);
f.setMilliseconds(730);
console.log(f);
f.setMonth(6);
console.log(f);
f.setTime()
console.log(f);

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