JavaScript challenge question

Question

Can you kindly explain each step of this one??

What is the output of this code?
let a = '2';
let b = 5;
console.log((b+a) + "" + (b-a));

Answer 1

ODLNT Oh i overlooked haha

EO4Wellness For the - operator, as A͢J has listed, it type coerced the string to number, and perform arithmetic subtraction.

Note that when JavaScript fails to convert string to number, for example, 'abc' - 'abc', there will be no error, the result will be NaN (not a number)

https://code.sololearn.com/cuiVNiJsBY8J/?ref=app

Answer 2

EO4Wellness

In JavaScript + is used as String concatination as well as addition of two numbers.

Since there 2 is string and 5 is number so here should be 52

But this behaviour doesn't apply on Subtraction, multiplication, division and modulus operator so

5 - '2' = 3
5 * '2' = 10
5 / '2' = 2.5
5 % 2 = 1

Answer 3

Okay so then if I understand both of you correctly: the correct answer is 523 because of concatenation.

52 because of (a+b)

the '''' part adds in effect nothing new because it is an empty string

3 because of the b-a part

??? Is that the correct way of looking at it then???

Thank you both for helping ...

Answer 4

brackets are evaluated first.

So
(b+a) is 5 + 2,
numerical addition,
results 7

(b-a) is 5 - 2,
numerical subtraction,
results 3

Now the operation becomes

7 + "" + 3

Note that "" is empty string,
and so the + operator performs string concatenation instead.

Type Coercion occurs!

7 (Number) is converted to "7" (string)

3 (Number) is converted to "3" (string)

So

"7" + "" + "3"

So result is

73

Type Coercion is special in JavaScript, tricky to beginner very often.

Answer 5

Gordon Yes. That's what I'm asking about. How does 5-'2' work?

Answer 6

This is very tricky! Thank you for taking the time to help. | After completing this challenge, I went back to check the correct answer, because I didn't understand it in relation to the 2 being a string. The answer was given as 523?

Answer 7

Thank you for your reply. SoloLearn gives the post-challenge correct answer for this question as 523. Panache Sigauke and Chinedu Gabriel

Answer 8

Exactly~ EO4Wellness

Answer 9

The result is 73
Coz
5+2 then 5-2
7 then 3
So
73

Not correct bcoz the 2 is a string not an integer, so i got no idea

Answer 10

let a = '2'; // string
let b = 5; // number
// ((5 + 2) + "" + (5 +2))
console.log((b+a) + "" + (b-a));

// solution 5252
// Remember that the addition operator ("+") is used for concatination and when adding a string with a number it only joins (concertinate's) the given values without actually adding it, except if both values or data types are numbers but if you use multiplication operator (*) javascript converts the datatype of a “number sting” to a number before carrying any mathematical computation for example console.log("2" * 3);
// **but note if its an actual string multpling a number javascript will return NaN as the result for example console.log("car" * 2);