How to Convert Strings to Integers in JavaScript?

How to Convert a String to an Integer in JavaScript

When working with numeric data in JavaScript, it's often necessary to convert strings representing numbers into actual integer values. Here are several methods for achieving this conversion:

Native Number Function:

The simplest option is to use the native Number function:

var x = Number("1000");

parseInt() Method:

The parseInt method is commonly used for converting strings to integers. It takes two parameters: the string to convert and the radix (base) of the number. For decimal numbers, specify the radix as 10:

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

Unary Plus Operator:

If the string is already in the form of an integer, you can simply use the unary plus operator to convert it:

var x = + "1000";

Math.floor() Method:

The Math.floor method returns the greatest integer less than or equal to a given number. This can be used to obtain an integer value from a string representing a float:

var x = Math.floor("1000.01"); // floor() automatically converts string to number

parseFloat() Method with Floor:

If the string may contain a float, you can use the parseFloat method to convert it to a floating-point number and then use floor to get the integer part:

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

Math.round() Method:

Similar to Math.floor, the Math.round method can also convert a string to an integer via automatic type conversion. It rounds the number to the nearest integer:

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

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