Spread operator JavaScript w3schools

The three dots (…) notation referred to as the Spread syntax has been part of React for a long time when it could be used via transpilation, although, it has been made a part of JavaScript as part of the ES2015 syntax.

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.

The three dots ( … ) are used in a function’s declaration as a parameter. These dots allow zero to multiple arguments to be passed when the function is called . The three dots are also known as var args .