JavaScript: Working with Numbers

Good Reads

1. https://medium.com/swlh/how-to-round-to-a-certain-number-of-decimal-places-in-javascript-ed74c471c1b8
2. https://stackoverflow.com/a/48764436/6275860

Advise

When performing any arithmetic operations such as addition. Always check if the candidate number variables are not Nan. Otherwise, the result becomes a NaN.

What is JavaScript equivalent for number_format in PHP?

1
2
3
4
5
6
7
8
9
// Lodash to rescue



// Works exactly as we expect. Output is a typeof number.

_.round("10.608", 2); // 10.61



// Following returns the output as string. That's one major down side.

parseFloat("10").toFixed(2); // 10.00

parseFloat("10.60").toFixed(2); // 10.60

parseFloat("10.605").toFixed(2); // 10.61