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The operator ... cannot be used in anywhere.

Rest Parameters

Only available in function parameters to "represent an indefinite number of arguments as an array".

function f(a, b, ...theArgs) {
  // ...
}

Spread Syntax

3 Cases are available

1) For function calls:

myFunction(...iterableObj);

2) For array literals or strings:

[...iterableObj, '4', 'five', 6];

3) For object literals (new in ECMAScript 2018):

let objClone = { ...obj };