new class js -advanced

02_advanced/MATERIAL/advanced-js/lesson_07/solutions/mixedCSV/solution_1.js

@@ -0,0 +1,34 @@
+// some, but not all fields are quoted - solution 1
+
+const mixedCSV =
+  '"very big, soft computer mouse","the cutest peripheral ever",10,39.90';
+
+let fields = [];
+let index = 0;
+let state = 'outside';
+
+mixedCSV.split('').forEach((char) => {
+  if (state === 'quoted') {
+    fields[index] += char; // => [",v,e,r,y..."]
+    if (char === '"') {
+      state = 'outside';
+      index += 1;
+    }
+  } else if (state === 'unquoted') {
+    if (char === ',') {
+      state = 'outside';
+      index += 1;
+    } else {
+      fields[index] += char;
+    }
+  } else if (state === 'outside') {
+    fields[index] = char; //=> [",...
+    if (char === '"') {
+      state = 'quoted';
+    } else if (char !== ',') {
+      state = 'unquoted';
+    }
+  }
+});
+
+console.log(fields);

02_advanced/MATERIAL/advanced-js/lesson_07/solutions/mixedCSV/solution_2.js

@@ -0,0 +1,28 @@
+// some, but not all fields are quoted - solution 2/2
+
+const mixedCSV =
+  '"very big, soft computer mouse",' + '"the cutest peripheral ever",10,39.90';
+
+let fields = [];
+
+const mixedCSVToArray = (s) =>
+  findCommaPositions(',' + s + ',')
+    .map((position, i, positions) => s.slice(position, positions[i + 1] - 1))
+    .slice(0, -1);
+
+const findCommaPositions = (s) =>
+  s
+    .split('')
+    .reduce(
+      (positions, char, position) =>
+        char === ',' && isEven(countQuotes(s.slice(0, position)))
+          ? positions.concat(position)
+          : positions,
+      []
+    );
+
+const countQuotes = (s) => s.split('').filter((c) => c === '"').length;
+
+const isEven = (num) => num % 2 === 0;
+
+console.log(mixedCSVToArray(mixedCSV));