Kevin Powell - Community•3y ago

Don't understanding this expression

Good afternoon everyone. I have some problems with the IntersectionObserver API and I am trying to breakdown the problems into small spices. Here is a question regarding to the JavaScript, in the following line of codes, I guess it a kind of if-statement, but I can't convert it into typical if-statement and understand it. Why there is a question mark? What are they doing? Confusing, can someone please point out what's the original face of it? https://github.com/mbarker84/smashing-io-header/blob/master/src/index.js#L67

GitHub

smashing-io-header/index.js at master · mbarker84/smashing-io-header

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2 Replies

CodeNascher•3y ago

it's a ternary operation. translates to

if (direction === "down") 
 const target = getTargetSection(entry)

else
 const target = entry.target

if (direction === "down") 
 const target = getTargetSection(entry)

else
 const target = entry.target

William_O^2OP•3y ago

Thank you, I will check the topic about ternary operation

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Don't understanding this expression