JavaScript: Check if two given numbers are approximately equal to each other

JavaScript fundamental (ES6 Syntax): Exercise-256 with Solution

Approximate Equality Check

Write a JavaScript program to check if two given numbers are approximately equal to each other.

• Use Math.abs() to compare the absolute difference of the two values to epsilon.
• Omit the third argument, epsilon, to use a default value of 0.001.

Sample Solution:

JavaScript Code:

//#Source https://bit.ly/2neWfJ2 
// Define a function 'approximatelyEqual' to check if two values are approximately equal within a specified epsilon range
const approximatelyEqual = (v1, v2, epsilon = 0.001) => Math.abs(v1 - v2) < epsilon;

// Test the 'approximatelyEqual' function with two values and a default epsilon value
console.log(approximatelyEqual(Math.PI / 2.0, 1.5708)); // true (approximately equal within the default epsilon range)

Output:

true

Flowchart:

Live Demo:

See the Pen javascript-basic-exercise-157-1 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

• Write a JavaScript program that checks if two floating-point numbers are approximately equal within a given epsilon.
• Write a JavaScript function that compares two numbers and returns true if their difference is less than a small threshold.
• Write a JavaScript program that validates numerical approximations by comparing absolute differences against a tolerance.
• Write a JavaScript function that tests for near-equality using relative and absolute error margins.

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