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Expressions and operators

This chapter documents all the JavaScript language operators, expressions and keywords.
JavaScript Operators

in operator

The in operator returns true if the specified property is in the specified object.
JavaScript Operator operator Relational Operators

Expressions and operators

This chapter describes JavaScript's expressions and operators, including assignment, comparison, arithmetic, bitwise, logical, string, ternary and more.
beginner Beginner Expressions Guide JavaScript Operators


The instanceof operator tests whether an object has in its prototype chain the prototype property of a constructor.
instanceof JavaScript Object operator Operator Prototype Relational Operators