In an object literal, the spread syntax enumerates the properties of an object and adds the key-value pairs to the object being. However, the operator actually returns the value of one of the specified operands, so if this operator is used with non-Boolean values, it will return a non-Boolean value. ) syntax allows an iterable, such as an array or string, to be expanded in places where zero or more arguments (for function calls) or elements (for array literals) are expected. It is typically used with boolean (logical) values. Instance methods () Calls a function with a given this value and optional arguments provided as an array (or an array-like object ). The logical OR () (logical disjunction) operator for a set of operands is true if and only if one or more of its operands is true. An ArrowFunction does not define local bindings for arguments, super, this, or new.target. However, this kind of functions differ from normal ones: They bind the this value. It will become the new object's prototype. As others have said, it's a new syntax to create functions.
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