[Add] : seminar1 level1

seminar_1/javascript.js

@@ -0,0 +1,79 @@
+var variable1 = "var variable";
+var variable1 = "new var variable";
+
+console.log("var: ", variable1);
+
+let variable2 = "let variable";
+
+console.log("let: ", variable2);
+
+const variable3 = "const variable";
+const variable3 = "new const variable";
+
+console.log("const: ", variable3);
+
+var variable1 = "var variable";
+variable1 = "new variable";
+
+console.log("var: ", variable1);
+
+let variable2 = "let variable";
+variable2 = "new variable";
+
+console.log("let: ", variable2);
+
+const variable3 = "const variable";
+// variable3 = "new variable"; //error
+
+if (true) {
+  var x = "var";
+}
+
+console.log(`var: ${x}`); // function scope
+
+if (true) {
+  let y = "let";
+}
+
+// console.log(`let: ${y}`);  // error y is block scope
+
+function foo() {
+  if (true) {
+    var variable = "hello";
+    console.log(`if block - `, variable);
+  }
+  console.log(`function block - ${variable}`);
+}
+
+// console.log(`global - ${variable}`) // error variable is no define
+
+let numArr = [1, 2, 3];
+const newArr = numArr.map((x) => x * 2);
+
+console.log(newArr);
+
+const sopt = {
+  season: 30,
+  group: ["YB", "OB"],
+  part: ["server", "plan", "design", "android", "ios", "web"],
+  president: "김규민",
+  introduce: function () {
+    this.part.map((name) => {
+      console.log(`솝트 내 파트는 ${name} 파트가 있어요.`);
+    });
+  },
+};
+
+let arr = [1, "item", true];
+let arr2 = Array(4, null, { item: "item" });
+
+arr.map((item) => console.log(item));
+arr2.map((item) => console.log(item));
+
+function sum(a, b) {
+  return a + b;
+}
+
+let sum = (a, b) => {
+  return a + b;
+};

seminar_1/typescript.ts

@@ -0,0 +1,117 @@
+let isDone: boolean = true;
+const str: string = "hello";
+
+let num: number = 2;
+// const sum:number = 'sum number' // error not assignable
+
+let arr: number[] = [1, 2, 3];
+const strArr: Array<string> = ["hello", "world"];
+const objArr: Array<object> = [{ item: "val1" }, { item: "val2" }];
+
+const foo = (obj: object): void => {
+  console.log(obj);
+};
+
+const boo = (obj: Object): void => {
+  console.log(obj);
+};
+
+// foo('hi'); // error not assignable
+boo("hi");
+
+function foo2(a: number, b: number): number {
+  return a + b;
+}
+
+const boo2 = (a: number, b: number): number => {
+  return a + b;
+};
+
+let a: null = null;
+// let x: null = 2; // errror not assignable
+
+let b: undefined = undefined;
+let y: undefined = null; // not assignable
+
+let myName: any = "gunmo";
+let myNameLength: number = (<string>myName).length;
+
+let yourName: any = "you";
+let yourNameLength: number = (yourName as string).length;
+
+const unknown: any = {
+  name: "gunmo",
+  age: 30,
+  organization: "sopt",
+  completion: [29, 30],
+};
+
+interface Sopt {
+  name: string;
+  age: number;
+  organization: string;
+  completion: number[];
+}
+
+const sopt: Sopt = {
+  name: "gunmo",
+  age: 30,
+  organization: "sopt",
+  completion: [29, 30],
+};
+
+const sopts: Sopt[] = [
+  {
+    name: "gunmo",
+    age: 30,
+    organization: "sopt",
+    completion: [29, 30],
+  },
+  {
+    name: "gunmo",
+    age: 30,
+    organization: "sopt",
+    completion: [29, 30],
+  },
+  {
+    name: "gunmo",
+    age: 30,
+    organization: "sopt",
+    completion: [29, 30],
+  },
+];
+
+interface Closet {
+  name: string;
+  shirt: number;
+  pants: number;
+  sunglass?: number;
+  hat?: number;
+}
+
+const ohmygirl: Array<Closet> = [
+  {
+    name: "hyo",
+    shirt: 5,
+    pants: 2,
+  },
+  {
+    name: "ye",
+    shirt: 3,
+    pants: 5,
+    sunglass: 4,
+  },
+];
+
+function greet() {
+  return "hello";
+}
+
+function timer() {
+  return setTimeout(() => {
+    return "End";
+  }, 3000);
+}
+
+greet();
+timer();