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``` [Taichi] version 0.8.12, llvm 10.0.0, commit 2cc32047, osx, python 3.8.2 [TaiGLSL] version 0.0.11 Traceback (most recent call last): File "demo-test.py", line 2, in from taichi_glsl import * File "/Users/puffy/Library/Python/3.8/lib/python/site-packages/taichi_glsl/__init__.py",...

what is the purposes of using filter(_ => _)?

1

in src/entry-clint.js line 47 ``` ... const asyncDataHooks = activated.map(c => c.asyncData).filter(_ => _) ... ``` in src/store/getters.js line 20 ``` ... activeItems (state, getters) { return getters.activeIds.map(id => state.items[id]).filter(_...