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Analysis and examples of the difference between ternary operator and if else in JS_javascript skills

WBOY
Release： 2016-05-16 16:30:50
Original
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Today I wrote a small demo of image carousel, using judgment

I tried if else first, the code is as follows:

Copy code The code is as follows:

if(n >= count-1){
n =0;
}else{
n ;
}

After the code is written, I am going to optimize the code and change this section to the ternary operator

Copy code The code is as follows:

n = n >= (count-1) ? n=0 : n

The results are completely different

Then I studied the difference between the two and summarized it in one sentence: ternary operation has a return value, if else has no return value

The following tests were done:

Copy code The code is as follows:

var n=1;
if(n>1){
n=0;
}else{
n ;
}
console.log(n);

Output result: 2


Ternary operation is as follows:

Copy code The code is as follows:

var n=1;
n = n>1?0 : n ;
console.log(n);
The output result is: 1

Insert a piece of other content: The difference between n and n: Simply put, n increases by 1. The difference is that n is incremented by 1 after executing the following statement; while n is done by n 1 before executing the following statement

What about n

if else statement

Copy code The code is as follows:

var n=1;
if(n>1){
n=0;
}else{
n;
}
console.log(n);
Output result: 2

Ternocular operation results

Copy code The code is as follows:

var n=1;
n = n>1?0 : n;
console.log(n); The output result is: 2


You can see the difference between if else and ternary operation~~~

There is no difference between n and n in this verification, because if else is calculated after the result, n will not be returned, and there is no return value

But for ternary operations, the n value returned by n is n itself, and the n value returned by n is the result after n 1

After reading this article, do you guys have a new understanding of the ternary operator and if else in js?

Related labels：
else if js
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