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##  #   ##      ##      ## ##    # #    #    # #   ##
##   #  ######  ##       ###      #    ###    #    ######

$ curl repovive.com/roadmaps/javascript/operators-expressions/when-to-use

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#####   ######  #####    ###    #   #  ###  #   #  ######
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$ curl repovive.com/roadmaps/javascript/operators-expressions/when-to-use

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When to Use ?? - Operators & Expressions | JavaScript | Repovive

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JavaScript22 sections · 783 units18h total

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When to Use ??

vs ||

Use ?? when 0, "", or false are valid values:

let count = userCount ?? 10
// If userCount is 0, keep 0 (don't replace with 10)

let enabled = setting ?? true
// If setting is false, keep false

Use || when you want to replace any falsy value:

let name = input || "Anonymous"
// Replace empty string with "Anonymous"

Choose based on whether 0, "", and false should count as "missing".