Web Reference: Converting Strings to Numbers The global method Number() converts a variable (or a value) into a number. A numeric string (like "3.14") converts to a number (like 3.14). An empty string (like "") converts to 0. A non numeric string (like "John") converts to NaN (Not a Number). Aug 26, 2025 · This chapter introduces the two most fundamental data types in JavaScript: numbers and strings. We will introduce their underlying representations, and functions used to work with and perform calculations on them. There are two main ways to convert a string to a number in JavaScript. One way is to parse it and the other way is to change its type to a Number. All of the tricks in the other answers (e.g., unary plus) involve implicitly coercing the type of the string to a number.
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