JavaScript Instanceof Operator Last Updated : 27 Dec, 2023 Summarize Suggest changes Share Like Article Like Report The instanceof operator in JavaScript is used to check the type of an object at run time. It returns a boolean value if true then it indicates that the object is an instance of a particular class and if false then it is not. Syntax:let gfg = objectName instanceof objectTypeParameters: objectName: States the name of the Object.Return Value: This method returns a boolean value if true then it indicates that the object is an instance of a particular class and if false then it is not. Example 1: Below is the example of the Instanceof Operator. html <!DOCTYPE html> <html lang="en"> <head> <title> How to Check/Uncheck the checkbox using JavaScript ? </title> </head> <body> <h1 style="color:green"> GeeksforGeeks </h1> <h3> Instanceof Operator. </h3> <p id="GFG"></p> <script> let a = ["Geeks", "for", "Geeks"]; document.getElementById("GFG").innerHTML = (a instanceof Array) + "<br>" + (a instanceof Number); </script> </body> </html> Output: JavaScript Instanceof Operator Example 2: Below is the example of the Instanceof Operator. html <!DOCTYPE html> <html lang="en"> <head> <title> How to Check/Uncheck the checkbox using JavaScript ? </title> </head> <body> <h1 style="color:green"> GeeksforGeeks </h1> <h3> Instanceof Operator. </h3> <p id="GFG"></p> <script> let fruits = ["Apple", "Mango", "Banana"]; document.getElementById("GFG").innerHTML = (fruits instanceof Array) + "<br>" + (fruits instanceof Object) + "<br>" + (fruits instanceof String) + "<br>" + (fruits instanceof Number); </script> </body> </html> Output: JavaScript Instanceof Operator Example 3: Demonstrating that String and Date objects are also a type of Object (derived from Object). JavaScript <script> var myString = new String(); var myDate = new Date(); console.log(myString instanceof Object); console.log(myString instanceof Date); console.log(myString instanceof String); console.log(myDate instanceof Date); console.log(myDate instanceof Object); console.log(myDate instanceof String); </script> Output: truefalsetruetruetruefalseWe have a complete list of Javascript Operators, to check those please go through the Javascript Operators Complete Reference article. Supported Browsers: Google ChromeFirefoxEdgeOperaApple Safari Advertise with us Next Article JavaScript String Operators K kartikgoel1999 Follow Similar Reads JS Arithmetic OperatorsJavaScript Addition (+) OperatorJavaScript addition (+) operator is one of the most fundamental and widely used arithmetic operators in JavaScript. It is used to perform arithmetic addition on numbers but also concatenate strings. 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Syntax: a |= b Where - a = First operandb = Second operand Example 1: In this example, we will use basic numer 2 min read Bitwise XOR Assignment (^=) Operator in JavaScriptThe Javascript Bitwise XOR assignment is represented by (^=). It is used to perform a bitwise XOR operation on both operands and assign the result to the left operand. Syntax: a ^= b // a = a ^ b Where - a = First operandb = Second operand Example: In this example, we will perform the basic Bitwise 2 min read JavaScript Logical AND assignment (&&=) OperatorThis operator is represented by x &&= y, and it is called the logical AND assignment operator. It assigns the value of y into x only if x is a truthy value. We use this operator x &&= y like this. Now break this expression into two parts, x && (x = y). If the value of x is tr 2 min read JavaScript Logical OR assignment (||=) OperatorThis operator is represented by x ||= y and it is called a logical OR assignment operator. If the value of x is falsy then the value of y will be assigned to x. When we divide it into two parts it becomes x || ( x = y ). It checks if x is true or false, if the value of x is falsy then it runs the ( 2 min read Nullish Coalescing Assignment (??=) Operator in JavaScriptThis is a new operator introduced by javascript. This operator is represented by x ??= y and it is called Logical nullish assignment operator. Only if the value of x is nullish then the value of y will be assigned to x that means if the value of x is null or undefined then the value of y will be ass 2 min read JS Comparison OperatorsEquality(==) Comparison Operator in JavaScriptIn JavaScript, the Comparison Equality Operator is used to compare the values of the operand. The comparison operator returns true only if the value of two operands are equal otherwise it returns false. 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Syntax: a===b E 2 min read Strict Inequality(!==) Comparison Operator in JavaScriptJavaScript Strict Inequality Operator is used to compare two operators and return true if they both are unequal. It is the opposite of the Strict Equality operator but like the Strict Equality Operator, it also does not perform type conversion. Syntax: a!==b Example 1: In this example, we will use t 1 min read Greater than(>) Comparison Operator in JavaScriptJavaScript Greater Than(>) Operator is used to compare two operands and return true if the left operand has a higher value than the right operator. Syntax: a>bExample 1: In this example, we will compare String, Number, and Boolean using Greater Than Operator. JavaScript console.log("3 1 min read Greater Than or Equal(>=) Comparison Operator in JavaScriptJavaScript Greater Than or Equal Operator(>=) is used to compare two operands and return true if the left operand has a value greater than or equal to the right operand. The algorithm used in the comparison is similar to that of less than comparison the only difference is that the values are swap 1 min read Less Than(JavaScript Less Than(<) Operator is used to compare two operands and return true if the left operand has a lesser value than the right operator. The values are converted to equal primitive types before conversion If both the values are strings the comparison is done on the basis of their Unicode. 1 min read Less Than or Equal(JavaScript Less Than or Equal(<=) to the operator is used to compare two operands and return true if the left operand is smaller or equal to the right operand. The algorithm used for the comparison is the same as that of less than operator but equal condition is also checked Syntax: a<=b Examp 1 min read JS Logical OperatorsNOT(!) Logical Operator inJavaScriptJavaScript NOT Operator can be used to find the flipped value of a boolean. It can be used to convert a true value to a false and vice-versa. 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This operator is frequently used in conditional statements to execu 1 min read JS Bitwise OperatorsAND(&) Bitwise Operator in JavaScriptJavaScript Bitwise AND(&) operator is used to compare two operands by performing an AND operation on the individual bits and returning 1 only if both the bits are one. The AND(&) Operator has a lot of real-world applications and the most famous one is to check whether a number is even or odd 2 min read OR(|) Bitwise Operator in JavaScriptJavaScript Bitwise OR(|) Operator is used to compare two operands by performing OR operation on individual bits of the operands and returns true even if one of the compared bits is 1. The OR Operator has vast applications and the most used one is combining bit values. The operation is represented by 2 min read XOR(^) Bitwise Operator in JavaScriptIn JavaScript, the bitwise XOR(^) Operator is used to compare two operands and return a new binary number which is 1 if both the bits in operators are different and 0 if both the bits in operands are the same. The operation is represented by the "^" symbol. This operator can be used to find the miss 2 min read NOT(~) Bitwise Operator in JavaScriptJavaScript NOT(~) Operator is used to invert the bits of a number. The operator is represented by "~" symbol. It is a unary operator since it requires only one operand to operate. There are various uses of the Bitwise NOT operator which include bit-masking, finding two's complement as well as error 1 min read Left Shift (JavaScript Left Shift Operator is used to operate on the two operands. The first operand is the number and the right operand specifies the number of bits to shift to the left. The operation is represented by the "<<" symbol. Mainly the left shift operator is used to multiply the number by any 2 min read Right Shift (>>) Bitwise Operator in JavaScriptJavaScript bitwise right shift operator is used to operate on two operands where the left operand is the number and the right operand specifies the number of bits to shift towards the right. A copy of old leftmost bits is maintained and they have added again the shifting is performed. The sign bit i 2 min read Zero Fill Right Shift (>>>) Bitwise Operator in JavaScriptJavaScript Zero Fill Right Shift Operator or Unsigned Right Shift Operator(>>>) is used for operating on the two operands. The first operand is the number and the right operand specifies the bits to shift towards the right modulo 32. In this way, the excess bits which are shifted towards th 2 min read JS Unary OperatorsJavaScript typeof OperatorThe typeof operator in JavaScript is used to determine the data type of a value or variable. It returns a string indicating the type, such as "string", "number", "boolean", "object", etc.JavaScriptconsole.log(typeof "Hello"); console.log(typeof 42); console.log(typeof true); console.log(typeof {}); 3 min read JavaScript delete OperatorThe delete operator in JavaScript removes properties from objects, including inherited ones, and creates holes in arrays without changing their length. If a deleted property holds an object with no other references, that object is automatically released by JavaScript's garbage collector over time.Sy 3 min read JS Relational OperatorsJavaScript in OperatorJavaScript in operator is an inbuilt operator which is used to check whether a particular property exists in an object or not. It returns a boolean value true if the specified property is in an object, otherwise, it returns false. Syntax:prop in objectParameters: prop: This parameter holds the strin 2 min read JavaScript Instanceof OperatorThe instanceof operator in JavaScript is used to check the type of an object at run time. It returns a boolean value if true then it indicates that the object is an instance of a particular class and if false then it is not. Syntax:let gfg = objectName instanceof objectTypeParameters: objectName: S 2 min read JS Other OperatorsJavaScript String OperatorsJavaScript String Operators are used to manipulate and perform operations on strings. There are two operators which are used to modify strings in JavaScript. These operators help us to join one string to another string.1. Concatenate OperatorConcatenate Operator in JavaScript combines strings using 3 min read JavaScript yield OperatorThe yield operator in JavaScript is used to hand over control of a generator function to another generator function or iterable object. It's handy for yielding values from an inner generator or iterable object within an outer generator function. This operator finds application in tasks like working 3 min read JavaScript Pipeline OperatorThe JavaScript Pipeline Operator (|>) is used for passing the result of one expression into a function. It's particularly useful for making long chains of functions easier to read. With this operator, the value before it gets sent as input to the function that follows. You simply arrange the func 2 min read JavaScript Grouping OperatorThe Grouping operator consists of a pair of parentheses around an expression or sub-expression to override the normal operator precedence so that expressions with lower precedence can be evaluated before an expression with higher priority. This operator can only contain expressions. The parameter li 2 min read Article Tags : JavaScript Web Technologies javascript-operators Like