initial commit

gen.js

@@ -0,0 +1,74 @@
+function randomBetween(min, max) {
+  min = Math.round(min);
+  max = Math.round(max);
+  return Math.floor(Math.random() * (max - min + 1) + min);
+}
+
+function shuffleArray(array) {
+  for (let i = array.length - 1; i > 0; i--) {
+    const j = Math.floor(Math.random() * (i + 1));
+    [array[i], array[j]] = [array[j], array[i]];
+  }
+}
+
+function generateRandomArithmeticExpression() {
+  const operators = ['+', '-', '*', '/']; // Array of arithmetic operators
+  const maxDecimalPlaces = 5;
+  const numOperands = randomBetween(10, 20);
+  const numParentheses = randomBetween(4, 8);
+
+  // Generate random numbers with two decimal places
+  let nums = [];
+  for (let i = 0; i < numOperands; i++) {
+    nums.push((Math.random() * 100).toFixed(randomBetween(1, maxDecimalPlaces)));
+  }
+
+  let res = [];
+
+  shuffleArray(nums);
+
+  let numRemainingOperands = nums.length;
+  let openParentheses = 0;
+
+  for (let i = 0; i < nums.length; i++) {
+    // Open a parenthesis if there are enough operands remaining
+    if (openParentheses < numParentheses && numRemainingOperands > 1 && Math.random() < 0.5) {
+      res.push('(');
+      openParentheses++;
+    }
+
+    res.push(nums[i]);
+
+    // Close a parenthesis if there are enough operands preceding it
+    if (openParentheses > 0 && numRemainingOperands > 2 && Math.random() < 0.5) {
+      res.push(')');
+      openParentheses--;
+    }
+
+    if (i < nums.length - 1) {
+      res.push(operators[randomBetween(0, 3)]);
+    }
+
+    numRemainingOperands--;
+  }
+
+  // Close any remaining open parentheses
+  while (openParentheses > 0) {
+    res.push(')');
+    openParentheses--;
+  }
+
+  return res.join('');
+}
+
+let res = '';
+
+for (let i = 0; i < 100; i++) {
+  let expr = generateRandomArithmeticExpression();
+  let val = eval(expr);
+
+  // res += `("${expr}", "${val}"),\n`;
+  res += `"${expr}",\n`;
+}
+
+console.log(res);