Searching how to convert string to integer in JavaScript? Here is 6 ways how to do it

Making a conversion of integer to JavaScript is a common task for every frontend developer, and therefore there is many solutions for this small problem.

Photo by Jan Huber on Unsplash
Photo by Jan Huber on Unsplash

1. Convert string to integer by using Number

                    var strToNum = Number("65");
console.log(strToNum);
// output => 65

2. Convert string to integer by using parseInt

                    var strToNum = parseInt("65");
console.log(strToNum);
// output => 65

3. Convert string to integer by using Math.floor

                    var strToNum = Math.floor("65");
console.log(strToNum);
// output => 65

4. Convert string to decimal number by using parseFloat

                    var strToNum = parseFloat("65.12");
console.log(strToNum);
// output => 65.12

5. Convert string to decimal rounded number

                    var strToNum = parseFloat("65.12").toFixed(0)
console.log(strToNum);
// output => 65

// OR

var strToNum =  Math.floor(Number("65.12"))
console.log(strToNum);
// output => 65

6. Convert string to number by multiplying it by one

This method seems to be the fastest way to convert string to integer:

                    var strToNum =  "65"*1
console.log(strToNum);
// output => 65

and it also works for decimal values:

                    var strToNum =  "65.12"*1
console.log(strToNum);
// output => 65.12