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06_2_groups.js

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class Group {

constructor() {

this.members = [];

}

add(value) {

if (!this.has(value)) {

this.members.push(value);

}

}

delete(value) {

this.members = this.members.filter(v => v !== value);

}

has(value) {

return this.members.includes(value);

}

static from(collection) {

let group = new Group;

for (let value of collection) {

group.add(value);

}

return group;

}

}

let group = Group.from([10, 20]);

console.log(group.has(10));

// → true

console.log(group.has(30));

// → false

group.add(10);

group.delete(10);

console.log(group.has(10));