Java Script Chapter 3

🔁 Chapter 3: Control Statements

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🔹 1. Conditional Statements

A. if Statement

if (marks > 50) {
  console.log("Pass");
}

B. if–else Statement

if (marks >= 33)
  console.log("Pass");
else
  console.log("Fail");

C. if–else if Ladder

if (marks >= 90)
  grade = "A";
else if (marks >= 75)
  grade = "B";
else
  grade = "C";

D. switch Statement

switch(day) {
  case 1: console.log("Monday"); break;
  case 2: console.log("Tuesday"); break;
  default: console.log("Invalid Day");
}

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🔹 2. Looping Statements

A. for Loop

for (let i = 1; i <= 5; i++) {
  console.log(i);
}

B. while Loop

let i = 1;
while (i <= 5) {
  console.log(i);
  i++;
}

C. do–while Loop

let i = 1;
do {
  console.log(i);
  i++;
} while (i <= 5);

D. for–of Loop (Arrays)

for (let x of arr) {
  console.log(x);
}

E. for–in Loop (Objects)

for (let key in person) {
  console.log(key + ": " + person[key]);
}

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🔹 3. Jump Statements

• break → exit loop early
• continue → skip current iteration

Example:

for (let i = 1; i <= 5; i++) {
  if (i == 3) continue;
  console.log(i);
}

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