Section 12: Numbers, Dates, Intl and Timers

168. Converting and Checking Numbers
     
     
     
     
169. Math and Rounding

sqrt is square root( 제곱근)

1부터 6까지 랜덤

Math.trunc(23.3) 결과 23
소수점 없앰
Math.round(23.3) 결과 23
Math.round(23.9) '' 24

Math.ceil(23.3) '' 24
소수점이 존재하면 무조건 올림

Math.floor(23.3) 무조건 내림
also type coercion

So basically floor and trunc, both cut off the decimal part when we are dealing with positive numbers.

However, for negative numbers, it doesn't work this way.

Math.trunc(-23.3)); -> -23

Math.floor(-23.3)); -> -24

170. The Remainder Operator

171. Working with BigInt

172. Creating Dates

     
     

173. Adding Dates to "Bankist" App

174. Operations With Dates
     15min

175. Internationalizing Dates (Intl)
     17min

176. Internationalizing Numbers (Intl)
     19min

177. Timers: setTimeout and setInterval
     14min

178. Implementing a Countdown Timer