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export const eq = (a, b) => {
if (a === b) {
return true;
}
if (a === null || b === null) {
return false;
}
if (typeof a != "object" || typeof b != "object") {
return false;
}
if (Array.isArray(a) !== Array.isArray(b)) {
return false;
}
if (Object.keys(a).length !== Object.keys(b).length) {
return false;
}
for (const k in a) {
if (!b.hasOwnProperty(k)) {
return false;
}
if (!eq(a[k], b[k])) {
return false;
}
}
return true;
};
export const keys = (ks, obj) =>
ks.reduce(
(ret, k) =>
obj.hasOwnProperty(k) ? {...ret, [k]: obj[k]} : ret,
{},
);
export const difference = (a, b) => {
const diff = new Set(a);
for (const el of b) {
diff.delete(el);
}
return diff;
};
export const assocIn = (obj, path, value) =>
path.length === 0 ? obj :
path.length === 1 ? { ...obj, [path[0]]: value } :
{
...obj,
[path[0]]: assocIn(
(obj[path[0]] || {}),
path.slice(1),
value
)
};
export const getIn = (obj, path) =>
path.length === 0 ? obj :
getIn(obj?.[path[0]], path.slice(1));
export const first = (arr, fn) => {
for (const x of arr) {
const ret = fn(x);
if (ret) {
return ret;
}
}
return null;
};
export const log = o => console.error(JSON.stringify(o));
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