Chapter 3: Samples

2020-10-28 02:18:01 +00:00
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+const fs = require("fs");
+const { pipeline, Transform } = require("stream");
+
+const uppercase = new Transform({
+  transform(chunk, encoding, callback) {
+    // Data processing
+    callback(null, chunk.toString().toUpperCase());
+  },
+});
+
+pipeline(
+  fs.createReadStream("./file.txt"),
+  uppercase,
+  fs.createWriteStream("./newFile.txt"),
+  (err) => {
+    if (err) {
+      console.error("Pipeline failed.", err);
+    } else {
+      console.log("Pipeline succeeded.");
+    }
+  }
+);