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Samuel Kendrick
Samuel Kendrick

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?? in JavaScript: the nullish coalescing operator.

#javascript #beginners #programming 
0 ?? "default";
// 0

false ?? "default";
// false

[] ?? "default"
// []

/** ⚠️ Pay attention.  */

null ?? "default";
// "default"

undefined ?? "default";
// "default"
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The ?? operator can be translated as: "return the value on the left UNLESS it's null or undefined. If the value is null or undefined, then use the value on the left of the ??.

<Avatar img={profilePicUrl ?? placeholder}/>
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