The && is the exact same operator as you would find in any javascript expression , such as… if( condition1 && condition2) { } It is a feature of javascript that an expression of the form… (condition1 && condition2) will evaluate to condition2, if condition1 is true, or null if condition1 is false.
Read moreWhat does 3 dots mean in React?
(three dots in JavaScript) is called the Spread Syntax or Spread Operator . This allows an iterable such as an array expression or string to be expanded or an object expression to be expanded wherever placed. This is not specific to React. It is a JavaScript operator.31 May 2017
Read moreWhat does 3 dots mean in JS?
Rest operator . When used within the signature of a function, where the function’s arguments should be, either replacing the arguments completely or alongside the function’s arguments, the three dots are also called the rest operator.
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