feat(tool): base converter

src/tools/integer-base-converter/integer-base-converter.model.ts

@@ -0,0 +1,20 @@
+export function convertBase({ value, fromBase, toBase }: { value: string; fromBase: number; toBase: number }) {
+  const range = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ+/'.split('');
+  const fromRange = range.slice(0, fromBase);
+  const toRange = range.slice(0, toBase);
+  let decValue = value
+    .split('')
+    .reverse()
+    .reduce((carry: number, digit: string, index: number) => {
+      if (!fromRange.includes(digit)) {
+        throw new Error('Invalid digit `' + digit + '` for base ' + fromBase + '.');
+      }
+      return (carry += fromRange.indexOf(digit) * Math.pow(fromBase, index));
+    }, 0);
+  let newValue = '';
+  while (decValue > 0) {
+    newValue = toRange[decValue % toBase] + newValue;
+    decValue = (decValue - (decValue % toBase)) / toBase;
+  }
+  return newValue || '0';
+}