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Jul 24, 2024
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r = (($_) => ($b === 10 && n < 0 ? $_.toFixed(Math.abs(n)) * 1 : $_))($b ** n)
Math.round(log(r) - n) /* tackle precision problem */ === 0
log($b ** x).toFixed(1) * 1 === x
($b ** log(x)).toFixed(1) * 1 === x
log(1) === 0
log($b) === 1
a = log(x * y)
b = log(x) + log(y)
{
if (x < 0 || y < 0) {
throw new Error(`x and y must be positive numbers`);
}
yield a === b || Math.round(a - b) === 0; // expected output: true
}
display = (code, identifier = "JavaScript") =>
Object.assign(
md`> ~~~${identifier}
${code}
~~~`,
inline
)
inline = ({
style: [
["--gap", "1ch"],
["border-left", "1px solid var(--syntax-key)"],
["margin-left", "0"],
["padding-left", "var(--gap)"],
["padding-left", ".5rem"],
["max-width", "none"]
]
.map((declaration) => declaration.join(": "))
.join("; ")
})
Math.round(10 ** lg(42) - 42) === 0 // expected output: true
Math.round(lge - 1 / ln10) === 0 // expected output: true
Math.round(lgⅱe - 1 / ln2) === 0 // expected output: true
Math.exp(1) === e
10 ** lge === e
2 ** lgⅱe === e
ln(e) / ln(10) === 1 / ln10
ln(e) / ln(2) === 1 / ln2
lg(e) === lge
lgⅱ(e) === lgⅱe
lge = Math.LOG10E
lgⅱe = Math.LOG2E
ln10 = Math.LN10
ln2 = Math.LN2
e = Math.E
$q = ["Math.E", base + ""][+!!base]
$b = [e, base][+!!base]
log = table.get(base)
table = new Map([
["", ln],
[2, lgⅱ],
[10, lg]
])
lg = Math.log10
lgⅱ = Math.log2 /* thank you, Mathias Bynens! - mg */
ln = Math.log
Purpose-built for displays of data
Observable is your go-to platform for exploring data and creating expressive data visualizations. Use reactive JavaScript notebooks for prototyping and a collaborative canvas for visual data exploration and dashboard creation.
