javascript

Figure 1–3. Doing some math with numbers
■ Note JavaScript’s value type conversion feature is covered more fully in Chapter 2.
Creating a Boolean Literal
CHAPTER 1 ■ REPRESENTING DATA WITH VALUES
Sometimes you will want a simple yes or no answer from JavaScript. In those circumstances, the return
value for an expression will be true for yes and false for no.
Click Clear in both Firebug panels, and let’s ask JavaScript whether Chocolate Fudge Brownie is just
chocolate ice cream. Note that the === operator tells you whether two values are identical:
"Chocolate Fudge Brownie" === "chocolate icecream";
// false
That’s an understatement. Alright, now let’s compare the previous calculation to its return value,
before verifying our work with Figure 1–4:
Math.round((6 * 14 + 21) / 7 * 365 * 100 / (4 * 260)) + " pints of Chocolate Fudge Brownie"
===
"526 pints of Chocolate Fudge Brownie";
// true
Figure 1–4. The === operator always returns a boolean.
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