# JavaScript: Round a number to a specified amount of digits

## JavaScript fundamental (ES6 Syntax): Exercise-152 with Solution

Write a JavaScript program to round a number to a specified amount of digits.

• Use Math.round() and template literals to round the number to the specified number of digits.
• Omit the second argument, decimals, to round to an integer.

Sample Solution:

JavaScript Code:

``````//#Source https://bit.ly/2neWfJ2
// Define a function 'round' that rounds a number 'n' to the specified number of 'decimals'
const round = (n, decimals = 0) =>
// Convert 'n' to a string in scientific notation with the desired number of decimals
Number(`\${Math.round(`\${n}e\${decimals}`)}e-\${decimals}`);

// Test the 'round' function with different inputs
console.log(round(1.005, 2)); // Output: 1.01
console.log(round(1.05, 2));  // Output: 1.05
console.log(round(1.0005, 2)); // Output: 1
```
```

Output:

```1.01
1.05
1
```

Visual Presentation:

Flowchart:

Live Demo:

See the Pen javascript-basic-exercise-152-1 by w3resource (@w3resource) on CodePen.

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