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runtime error javascript

Mehedi Islam Ripon answered on March 11, 2023 Popularity 6/10 Helpfulness 5/10

answer runtime error javascript

runtime error javascript

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A runtime error in JavaScript is an error that occurs during the execution of a
program when it is running. These errors can occur due to various reasons, such
as invalid input data, unexpected conditions, or logical errors in the code.

Here are two common examples of runtime errors in JavaScript:

1. Type Errors: This error occurs when an operation is performed on a value that
is not of the expected type.
let x = 10;
x.toUpperCase(); // TypeError: x.toUpperCase is not a function
In the above example, we are trying to call the toUpperCase() method on a number,
which is not a valid operation, and thus, it results in a TypeError.

2. Reference Errors: This error occurs when a non-existent or undefined 
variable is referenced in the code.
let y = undefined;
console.log(y.a); // ReferenceError: y is not defined
In the above example, we are trying to access the property a of an undefined 
variable y, which results in a ReferenceError.

Popularity 6/10 Helpfulness 5/10 Language javascript

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Contributed on Mar 11 2023

Mehedi Islam Ripon

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