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). 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. Jul 23, 2025 · To convert a string to number in JavaScript, various methods such as the Number () function, parseInt (), or parseFloat () can be used. These functions allow to convert string representations of numbers into actual numerical values, enabling arithmetic operations and comparisons.
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