Personally, I favor function declarations. However, if the logic is simple enough, I'll consider using a function expression using an arrow function (typically for functional composition).
Both of these are functionally equivalent:
const isTruthy = (item) => item function isTruthyLong (item) { return item }
When you use them as the callback for array.filter() they behave the same.
array.filter()
let a = Array(3) // [undefined, undefined, undefined] a[1] = 'Hi mom!' let short = a.filter(isTruthy) let long = a.filter(isTruthyLong) console.log(a) // [undefined, 'Hi mom!', undefined] console.log(short) // ['Hi mom!'] console.log(long) // ['Hi mom!']
CodePen Demo
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Personally, I favor function declarations. However, if the logic is simple enough, I'll consider using a function expression using an arrow function (typically for functional composition).
Both of these are functionally equivalent:
When you use them as the callback for
array.filter()they behave the same.CodePen Demo