typeof - JavaScript | MDN - MDN Web Docs
2023年9月12日 · The typeof operator returns a string indicating the type of the operand's value.
JavaScript typeof - W3Schools
typeof ("John"+"Doe") // Returns "string" typeof 3.14 // Returns "number" typeof (33 + 66) // Returns "number" typeof NaN // Returns "number" typeof 1234n // Returns "bigint" typeof true …
typeof - MDN Web Docs
The typeof operator returns a string indicating the type of the unevaluated operand.
JavaScript typeof
The typeof operator accepts an operand and returns a string representing the type of the operand. The following shows the syntax of the typeof operator: typeof (operand) Code language: …
JavaScript typeof : Understanding type checking in JavaScript
2018年9月27日 · Type checking with the typeof operator in JavaScript can sometimes be misleading. Learn common pitfalls and how to avoid them in our tutorial.
JavaScript typeof Operator - GeeksforGeeks
2024年5月31日 · typeof operator in JavaScript identifies the data type of a variable or expression, returning a corresponding string.
JavaScript typeof Operator - Programiz
The typeof operator returns the type of variables and values. For example, const a = 9; console.log(typeof a); // number console.log(typeof '9'); // string console.log(typeof false); // …
JavaScript TypeOf – How to Check the Type of a Variable or …
2020年11月9日 · Use the typeof operator for detecting types. There are two variants of the typeof operator syntax: typeof and typeof(expression). The result of a typeof operator may be …
How to Check Type with the typeof Operator in JavaScript
2022年12月9日 · How to Check Type with the typeof Operator in JavaScript. The typeof operator accepts a single operand (a unary operator) and determines the operand's type. There are two …
TypeScript: Documentation - Typeof Type Operator
TypeScript adds a typeof operator you can use in a type context to refer to the type of a variable or property:
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