Published
Edited
Jul 27, 2019
Importers
function test(expected, actual) {
if (expected === actual) {
return actual + " (ok)";
} else {
return "(" + typeof actual + ") " + actual + " <= FAILED: (expected (" + typeof expected + ") " + expected + ")";
}
}
function abs(n) {
return signum(n) == -1 ? negate(n) : n;
}
function isBig(n) {
return (typeof n) == "bigint";
}
function isNumber(n) {
return (typeof n) == "number";
}
function isOne(n) {
return n == 1;
}
function isZero(n) {
return n == 0;
}
function negate(n) {
return -n;
}
function negOne(n) {
return negate(one(n));
}
function one(n) {
return isBig(n) ? 1n : 1;
}
function signum(n) {
return n == 0 ? 0 : n < 0 ? -1 : 1;
}
function zero(n) {
return isBig(n) ? 0n : 0;
}
function eulerTotient(n) {
var result = n;
for(var i=2; i*i <= n; i++) {
if (n % i == 0) result -= result / i;
while (n % i == 0) {
n /= i;
}
}
if (n > 1) {
result -= result / n;
}
return result;
}
function isPowerOfTwo(n) {
return (n != 0) && ( (n & -n) == n );
}
function getRandomNumber(limit = 100) { return Math.floor((Math.random() - 0.5) * limit); }
function getIdentityMatrix(size = 3) {
var rows = [];
for (let r = 0; r < size; r++) {
var cols = [];
for (let c = 0; c < size; c++) {
cols.push(r == c ? 1 : 0);
}
rows.push(cols);
}
return rows;
}
function getAdditionTable(size = 3) {
var rows = [];
for (let r = 0; r < size; r++) {
var cols = [];
for (let c = 0; c < size; c++) {
cols.push(r+c);
}
rows.push(cols);
}
return rows;
}
function getMultiplicationTable(size = 3) {
var rows = [];
for (let r = 0; r < size; r++) {
var cols = [];
for (let c = 0; c < size; c++) {
cols.push((r+1) * (c+1));
}
rows.push(cols);
}
return rows;
}
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.
