Console: -

The console is the most important and used object of JavaScript used for the print, debugging the console.

The console is a built-in object in JavaScript used for:

• Printing output

• Debugging code

• Monitoring program execution

console.log(): -

console.log is the most important and widely used method used for the printing the value massage to the console(or terminal in node.js).

console.log("Hi, this is a printing statement.");

Output:-

Hi, this is a printing statement.

let value = 10;
console.log("value: ",value);

output: -

value: 10

console.log() method is used to:

• Print the details

• print value

• debugging

console.error: -

console.error () method is used to show the error in the console. It mostly appear in red color (❌) sign. It show the some error help to identify an error.

console.error("This is an error");

Output: -

❌This is an error

It helps to identify the bug quickly.

console.table() : -

It is used to show the object/Array in the form of table in the console(or in terminal of Node.js).

const student = {
    name: "Ranjeet",
    class:"2D",
    rollNo: 603,
};
console.table(student);

output:-

(index)	Values
name	Ranjeet
class	2D
rollNo	603

console.warn():-

This method is call to show the warning to the user to warn him for certain scenario. Typically, it is shown in the yellow colour(⚠️).

console.warn("This is a warning message.");

Output: -

⚠️This is a warning message.

console.info():-

console.info() is used to print or show the information.

console.info("This is an information");

Output:-

This is an information

Similar to console.log() but semantically clearer.

console.group():-

console.group() function is the method use to create certain amount of code in group together. It has two function to group the block of code.

• console.group()

• console.groupEnd();

console.group("Group started here: - ");
console.log("hi this is Ranjeet");
console.log("hi this is Ranjeet");
console.log("hi this is Ranjeet");
console.log("hi this is Ranjeet");
console.groupEnd();

Output

Group started here: - 
  hi this is Ranjeet
  hi this is Ranjeet
  hi this is Ranjeet
  hi this is Ranjeet

console.time(): -

console.time() shows the the time takes to show the time taken to execute the the the block of code. It measure the execution time of the code.

console.time("Time to start now"); 
for(let i = 0; i <= 1000; i++){} 
console.timeEnd("Time to start now");

Output: -

Time to start now: 0.1 ms

console.count():-

console.count() is the method that show the number of time a block of code executed.

for(let i = 0; i < 5; i++){
    console.count();
}

Output:-

default: 0
default: 1
default: 2
default: 3
default: 4

By default if no printing statement is present it show and print default and show counting.

console.count("Loop");
console.count("Loop");
console.count("Loop");
console.count("Loop");

Output : -

Loop: 1
Loop: 2
Loop: 3
Loop: 4

When multiple massage available,

console.count("hi first");
console.count("hi first");
console.count("hi second");
console.count("hi first");
console.count("hi second");
console.count("hi second");

Output: -

hi first: 1
hi first: 2
hi second: 1
hi first: 3
hi second: 2
hi second: 3

Reset Counter

console.countReset() is used to reset the count to 1 and start it again.

console.count("Hi");
console.count("Hi");
console.count("Hi");
console.countReset("Hi");
console.count("Hi");

Output: -

Hi: 1
Hi: 2
Hi: 3
Hi: 1