string problem solving init

Author: lgope

Interview-Questions/makeQueryString.js

@@ -0,0 +1,52 @@
+/**
+ * make query string from an object
+ * 1st case
+ * input: {
+    foo: 'hello',
+    bar: 'world',
+    baz: 'true'
+}
+* output: '?foo=hello&bar=world&baz'
+*/
+
+const makeQueryString = (obj) => {
+  const queries = [];
+
+  // check value if true then concate only key else concate key & value.
+  const insertStr = (key, value) => {
+    queries.push(`${key}${value === "true" ? "" : "=" + value}`);
+  };
+  console.log(1, Object.entries(obj));
+
+  for (let [key, value] of Object.entries(obj)) {
+    // if value is string then
+    if (typeof value === "string") value = [value];
+
+    for (let item of value) {
+      insertStr(key, item);
+    }
+  }
+
+  return `?${queries.join("&")}`;
+};
+
+// console.log(
+//   makeQueryString({
+//     foo: "hello",
+//     bar: "world",
+//     baz: "true",
+//   })
+// );
+
+console.log(
+  makeQueryString({
+    foo: ["hello", "earth"],
+    bar: "world",
+    baz: "true",
+  })
+);
+
+console.log(makeQueryString({}));
+
+// encodeURIComponent()
+// decodeURIComponent()

Interview-Questions/queryString.js

@@ -35,12 +35,10 @@ const formatQueryString = (str) => {
 
   //   iterate through key value pairs, split on = , and save in res object as key value
   for (const pair of query) {
-    let [key, value] = pair.split("=");
+    let [key, value= 'true'] = pair.split("="); // checking value is truthy or undefined else befault 'true' value (3rd case)
 
     // check if key truthy else send empty object (2nd case)
     if (key) {
-      value = value || "true"; // checking value is truthy or undefined else befault 'true' value (3rd case)
-
       // if there is value with the same key, have to save values as array item (4th case)
       resObj[key] = resObj[key]
         ? typeof resObj[key] === "string"
@@ -59,18 +57,18 @@ const formatQueryString = (str) => {
   return resObj;
 };
 
-// console.log("1st case: ", formatQueryString("?foo=hello&bar=world"), {
-//     foo: 'hello',
-//     bar: 'world'
-//  });
+console.log("1st case: ", formatQueryString("?foo=hello&bar=world"), {
+    foo: 'hello',
+    bar: 'world'
+ });
 // console.log("2nd case: ", formatQueryString("?"), {}); // if there is no query after ?
 // console.log("3rd case: ", formatQueryString("?foo=hello&bar=world&baz"), {
 //   foo: "hello",
 //   bar: "world",
 //   baz: "true",
 // });
 
-/*console.log(
+console.log(
   "4th case: ",
   formatQueryString("?foo=hello&bar=world&baz&foo=again&foo=ok&bar=again&baz&dummy&data=earth"),
   {
@@ -80,9 +78,9 @@ const formatQueryString = (str) => {
   dummy: 'true',
   data: 'earth'
   }
-); */
+);
 
 // test case
-console.log("4th case: ", formatQueryString("?foo=hello&foo"), {
-  foo: ["hello", "true"],
-});
+// console.log("4th case: ", formatQueryString("?foo=hello&foo"), {
+//   foo: ["hello", "true"],
+// });