3 docs tagged with "Undefined"

What is the data type in JavaScript? Learn about the primitive and non-primitive data types in JavaScript, including string, number, bigint, boolean, undefined, symbol, null, object, array, and function.

What is the type operator in JavaScript? Learn about the type operator, its syntax, and how to use it to check the data type of a value or variable in JavaScript.

What is the undefined data type in JavaScript? Learn about the undefined data type and how to create undefined in JavaScript.