How to use @swim/structure - 10 common examples

insert(index: number, newValue: Value, key?: Value): this {
    if (index < 0 || index > this._state.length) {
      throw new RangeError("" + index);
    }
    newValue = this.listWillUpdate(index, newValue);
    this._state.insert(index, newValue, key);
    const newEntry = this._state.getEntry(index)!;
    this.listDidUpdate(index, newValue, Value.absent());
    const header = Record.create(2).slot("key", newEntry[0]).slot("index", index);
    this.command(Attr.of("update", header).concat(newValue));
    return this;
  }

mirrorDidPressDown(charge: ChargeView, view: MirrorView): void {
    const id = charge.id;
    const x = Math.round(charge.originX.state! * 10000) / 10000;
    const y = Math.round(charge.originY.state! * 10000) / 10000;
    const phaseCount = charge._phases.length;
    const phases = Record.create(phaseCount);
    for (let i = 1; i < phaseCount; i += 1) {
      const phase = Math.round(charge._phases[i] * 100) / 100;
      phases.item(phase);
    }
    const color = charge.chargeColor.state!.toString();
    const command = Record.create(5)
        .slot("id", id)
        .slot("x", x)
        .slot("y", y)
        .slot("phases", phases)
        .slot("color", color);
    this.nodeRef.command("ripple", command);
  }

mirrorDidPressHold(charge: ChargeView, view: MirrorView): void {
    const id = charge.id;
    const x = Math.round(charge.centerX.state! * 10000) / 10000;
    const y = Math.round(charge.centerY.state! * 10000) / 10000;
    const r = charge.chargeRadius.state! / 2;
    const color = charge.chargeColor.state!.toString();
    const command = Record.create(6)
        .attr("hold")
        .slot("id", id)
        .slot("x", x)
        .slot("y", y)
        .slot("r", r)
        .slot("color", color);
    this.nodeRef.command("charge", command);
  }

push(...newValues: Value[]): number {
    for (let i = 0; i < newValues.length; i += 1) {
      const index = this._state.length + i;
      const newValue = this.listWillUpdate(index, newValues[i]);
      this._state.insert(index, newValue);
      const newEntry = this._state.getEntry(index)!;
      this.listDidUpdate(index, newValue, Value.absent());
      const header = Record.create(2).slot("key", newEntry[0]).slot("index", index);
      this.command(Attr.of("update", header).concat(newValue));
    }
    return this._state.length;
  }

shift(): Value {
    if (this._state.length > 0) {
      this.listWillRemove(0);
      const oldEntry = this._state.getEntry(0)!;
      this._state.remove(0);
      this.listDidRemove(0, oldEntry[1]);
      const header = Record.create(2).slot("key", oldEntry[0]).slot("index", 0);
      this.command(Record.create(1).attr("remove", header));
      return oldEntry[1];
    } else {
      return Value.absent();
    }
  }

remove(index: number, key?: Value): this {
    if (key !== void 0) {
      index = this._state.lookup(key, index);
      if (index < 0) {
        throw new RangeError("" + key);
      }
    }
    if (index < 0 || index > this._state.length) {
      throw new RangeError("" + index);
    }
    this.listWillRemove(index);
    const oldEntry = this._state.getEntry(index)!;
    this._state.remove(index);
    this.listDidRemove(index, oldEntry[1]);
    const header = Record.create(2).slot("key", oldEntry[0]).slot("index", index);
    this.command(Record.create(1).attr("remove", header));
    return this;
  }

unshift(...newValues: Value[]): number {
    for (let i = newValues.length - 1; i >= 0; i -= 1) {
      const newValue = this.listWillUpdate(0, newValues[i]);
      this._state.insert(0, newValue);
      const newEntry = this._state.getEntry(0)!;
      this.listDidUpdate(0, newValue, Value.absent());
      const header = Record.create(2).slot("key", newEntry[0]).slot("index", 0);
      this.command(Attr.of("update", header).concat(newValue));
    }
    return this._state.length;
  }

pop(): Value {
    const index = this._state.length - 1;
    if (index >= 0) {
      this.listWillRemove(index);
      const oldEntry = this._state.getEntry(index)!;
      this._state.remove(index);
      this.listDidRemove(index, oldEntry[1]);
      const header = Record.create(2).slot("key", oldEntry[0]).slot("index", index);
      this.command(Record.create(1).attr("remove", header));
      return oldEntry[1];
    } else {
      return Value.absent();
    }
  }

mirrorDidPressDown(charge: ChargeView, view: MirrorView): void {
    const id = charge.id;
    const x = Math.round(charge.originX.state! * 10000) / 10000;
    const y = Math.round(charge.originY.state! * 10000) / 10000;
    const phaseCount = charge._phases.length;
    const phases = Record.create(phaseCount);
    for (let i = 1; i < phaseCount; i += 1) {
      const phase = Math.round(charge._phases[i] * 100) / 100;
      phases.item(phase);
    }
    const color = charge.chargeColor.state!.toString();
    const command = Record.create(5)
        .slot("id", id)
        .slot("x", x)
        .slot("y", y)
        .slot("phases", phases)
        .slot("color", color);
    this.nodeRef.command("ripple", command);
  }

if (fromIndex < 0) {
        throw new RangeError("" + key);
      }
    }
    if (fromIndex < 0 || fromIndex >= this._state.length) {
      throw new RangeError("" + fromIndex);
    }
    if (toIndex < 0 || toIndex >= this._state.length) {
      throw new RangeError("" + toIndex);
    }
    if (fromIndex !== toIndex) {
      const entry = this._state.getEntry(fromIndex)!;
      this.listWillMove(fromIndex, toIndex, entry[1]);
      this._state.remove(fromIndex).insert(toIndex, entry[1], entry[0]);
      this.listDidMove(fromIndex, toIndex, entry[1]);
      const header = Record.create(2).slot("key", entry[0]).slot("from", fromIndex).slot("to", toIndex);
      this.command(Record.create(1).attr("move", header));
    }
    return this;
  }