How to convert a string to a number in JavaScript?

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. You can also do the same thing explicitly with the Number function.

How to return a number in JavaScript?

For booleans, Number () returns 0 or 1. For dates, Number () returns milliseconds since January 1, 1970 00:00:00. For strings, Number () returns a number or NaN. Optional. A JavaScript value (variable). Returns the value as a number. If the value cannot be converted to a number, NaN is returned. If no value is provided, 0 is returned.

Is 37 a bigint or a number in JavaScript?

There is no separate integer type in common everyday use. (JavaScript also has a BigInt type, but it's not designed to replace Number for everyday uses. 37 is still a number, not a BigInt.) When used as a function, Number (value) converts a string or other value to the Number type. If the value can't be converted, it returns NaN.

What is a number literal in JavaScript?

The lexical grammar contains a more detailed reference. A number literal like 37 in JavaScript code is a floating-point value, not an integer. There is no separate integer type in common everyday use. (JavaScript also has a BigInt type, but it's not designed to replace Number for everyday uses. 37 is still a number, not a BigInt.)