iframe-proxy | Sunbelt Computer Software

36 lines (29 loc) · 713 Bytes

import {ascending, descending} from "d3";

export function defined(x) {

return x != null && !Number.isNaN(x);

}

export function ascendingDefined(a, b) {

return defined(b) - defined(a) || ascending(a, b);

}

export function descendingDefined(a, b) {

return defined(b) - defined(a) || descending(a, b);

}

export function nonempty(x) {

return x != null && (x + "") !== "";

}

export function filter(index, ...channels) {

for (const c of channels) {

if (c) index = index.filter(i => defined(c[i]));

}

return index;

}

export function positive(x) {

return x > 0 ? x : NaN;

}

export function firstof(...values) {

for (const v of values) {

if (v !== undefined) {

return v;

}

Sunbelt Computer Software