Making parameters required
Regular JavaScript has no concept of required parameters. We can use default parameter values to emulate this feature.
JavaScript
Read fire tipMapping array values with constructors
JavaScript
Some type constructors can be called as regular functions in JavaScript. We can use them when mapping over arrays to quickly transform the values in them to that type.
// values passed to a constructor are transformed to that type
[4, 8, 15].map(number => String(number)) // ⇒ ["4", "8", "15"]
["16", "23", "42"].map(string => Number(string)) // ⇒ [16, 23, 42]
[1, 1, 0].map(value => Boolean(value)) // ⇒ [true, true, false]
// we only pass the values through, so we can use this shorthand notation
[4, 8, 15].map(String) // ⇒ ["4", "8", "15"]
["16", "23", "42"].map(Number) // ⇒ [16, 23, 42]
[1, 1, 0].map(Boolean) // ⇒ [true, true, false]
More fire tips
Removing duplication with ternary operators
The ternary operator can be used at many levels. The further we move it into a statement, the more duplication it can save us.
JavaScriptreadability
Read fire tipRemoving specific values from an array
JavaScript
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