Convert a negative number to positive in JavaScript

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In this article, we will see how we can convert a negative number to a positive number in javascript by the methods described below.

Method 1: This is a general method in which we will first check whether the number is already positive or negative, if the number is negative then we will multiply the number by -1 to make it positive.

Syntax:

if (a < 0) {
    a = a * -1;
}

Example: Below is the implementation of the above approach:

javascript

// Javascript script to convert negative number
// to positive number
 
// Function to convert
// given number to
// positive number
function convert_positive(a) {
    // Check the number is negative
    if (a < 0) {
        // Multiply number with -1
        // to make it positive
        a = a * -1;
    }
    // Return the positive number
    return a;
}
 
//Driver code
let n = -10;
let m = 5;
 
// Call function
n = convert_positive(n);
 
// Print result
console.log(n);
 
// Call function
m = convert_positive(m);
 
// Print result
console.log(m);

Output:

10
5

Method 2: In this method, we will use Math.abs() function to convert negative numbers to positive numbers.

Syntax:

Math.abs(value)

Example: Below is the implementation of the above approach:

javascript

// Javascript script to convert negative number
// to positive number
 
//Driver code
let n = -30;
let m = 15;
 
// Using Math.abs() function
n = Math.abs(n);
 
// Print result
console.log(n);
 
// Using Math.abs() function
m = Math.abs(m);
 
// Print result
console.log(m);

Output:

30
15

Method 3: In this method, we will check whether the number is positive or negative, if the number is negative then we add a minus sign at the beginning of the number else return the same.

Syntax:

a < 0 ? -(a) : a

Example: This example shows the above-explained approach.

Javascript

// Javascript script
// to convert negative number
// to positive number
 
// Function to convert
// given number to
// positive number
function convert_positive(a) {
    return a < 0 ? -(a) : a;
}
 
//Driver code
let n = -10;
let m = 5;
 
// Call function
n = convert_positive(n);
 
// Print result
console.log(n);
 
// Call function
m = convert_positive(m);
 
// Print result
console.log(m);

Output:

10
5

Method 4: In this method, we will use a bit-wise not operator which flips all the bits of the number. Since the negative number is stored in a most significant bit it also flips which converts it to a positive number.

Syntax:

a < 0 ? ( ~a + 1 ) : a

Example:

Javascript

// Javascript script
// to convert negative number
// to positive number
 
// Function to convert
// given number to
// positive number
function convert_positive(a) {
    return a < 0 ? (~a + 1) : a;
}
 
//Driver code
let n = -10;
let m = 5;
 
// Call function
n = convert_positive(n);
 
// Print result
console.log(n);
 
// Call function
m = convert_positive(m);
 
// Print result
console.log(m);