Function if

source/Masonry/Masonry.example.js:212–221

(typeof this._cellPositioner === 'undefined')

  _initCellPositioner() {
    if (typeof this._cellPositioner === 'undefined') {
      const {columnWidth, gutterSize} = this.state;

      this._cellPositioner = createCellPositioner({
        cellMeasurerCache: this._cache,
        columnCount: this._columnCount,
        columnWidth,
        spacer: gutterSize,
      });
    }
  }

  _onResize({width}) {