How to return a spread operator in a map arrow function in one line [duplicate]

javascript arrays ecmascript-6 spread-syntax

When returning a literal object from an arrow function construct (a lambda), you have to wrap it in parentheses so that it's seen as an expression:

data.map(item => ({...item, active: false}));

map is only useful if you need a different array.

But there's a simpler solution here. You don't have to reassign all items and data. You should simply do

data.forEach(item => item.active=false)

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