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'use strict';
export function create(obj, proto=Object.prototype) {
const props = Object.keys(obj)
.map((key) => [ key, { value: obj[key], enumerable: true } ])
.reduce((acc, [ key, value ]) => ({ ...acc, [key]: value }), {});
return Object.create(proto, props);
};
export function random_choice(collection, r) {
const idx = Math.floor(collection.length * r);
return collection[idx];
}
export function pairs(arr1, arr2) {
return arr1
.map((x, i) => arr2.map(y => [x, y]))
.flat();
}
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