Render Phase vs Commit Phase
React first calls components to compute the next tree (render phase — pure, interruptible, may run more than once or be discarded), then applies the resulting mutations to the DOM and runs effects (commit phase — synchronous, exactly once). Anything with observable side effects belongs after commit, never during render.
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React first calls components to compute the next tree (render phase — pure, interruptible, may run more than once or be discarded), then applies the resulting mutations to the DOM and runs effects (commit phase — synchronous, exactly once). Anything with observable side effects belongs after commit, never during render.
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