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JavaScript: How to find min/max values without math functions?
- 王林forward
- 2023-08-24 13:09:091487browse
In this article, we will explore how to find the minimum and maximum values from an array without using mathematical functions. Math functions including Math.min() and Math.max() return the minimum and maximum of all numbers passed in an array.
Method
We will use the same functionality as a math function, which can be implemented using a loop.
This will use a for loop to iterate over the array elements and update the minimum and maximum elements in the variable after comparing with each element in the array.
When a value greater than the maximum value is found, we update the maximum variable and similarly the minimum value.
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Example
In the following example, we find the maximum and minimum values from an array without using mathematical functions.
#Filename: index.html
<!DOCTYPE html>
<html lang="en">
<head>
<title>Find Min and Max</title>
</head>
<body>
<h1 style="color: green;">
Welcome to Tutorials Point
</h1>
<script>
// Defining the array to find out
// the min and max values
const array = [-21, 14, -19, 3, 30];
// Declaring the min and max value to
// save the minimum and maximum values
let max = array[0], min = array[0];
for (let i = 0; i < array.length; i++) {
// If the element is greater
// than the max value, replace max
if (array[i] > max) { max = array[i]; }
// If the element is lesser
// than the min value, replace min
if (array[i] < min) { min = array[i]; }
}
console.log("Max element from array is: " + max);
console.log("Min element from array is: " + min);
</script>
</body>
</html>Output
After successfully executing the above program, the browser will display the following results-
Welcome To Tutorials Point
In the console you will find the result, see screenshot below -
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