How Can I Convert Strings to Integers in JavaScript?

Converting Strings to Integers in JavaScript

In JavaScript, there are several methods available for converting a string to an integer.

Native Number Function

The simplest method is to use the native Number function:

const x = Number("1000");

parseInt()

The parseInt() function converts a string to an integer, optionally specifying the radix (base) of the number. By default, it uses radix 10, resulting in a decimal number.

const x = parseInt("1000", 10);

Unary Plus Operator

If the string is already an integer (without leading or trailing characters), the unary plus operator ( ) can be used:

const x = +"1000";

Math.floor()

If the string represents a float and you want to convert it to an integer, Math.floor() can be used:

const x = Math.floor("1000.01");

parseFloat() with Math.floor()

If you want to preserve the decimal part (if any) and then round it to the nearest integer, you can use parseFloat() and Math.floor():

const x = Math.floor(parseFloat("1000.01"));

Math.round()

Similar to Math.floor(), Math.round() also performs string-to-number conversion and returns a rounded number:

const x = Math.round("1000"); // Equivalent to round("1000", 0)

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