Logic and Control Flow

Conditional Statements

If-Else statement

if (condition) {
  // code to be executed if the condition is true
} else {
  // code to be executed if the condiyion is false
}

If- Else If -Else statement

if (condition1) {
  // code to be executed if the condition is true
} else if (condition2) {
  /* code to be executed if the
     condition1 is false and
     condition2 is true */
} else {
  /* code to be executed if
     condition1 is false and
     condition2 is false */
}

Switch statement

switch (expression) {
  case x:
    // code block
    break;
  case y:
    // code block
    break;
  default:
    // code block
}

Ternary Operator

condition ? exprIFTrue : exprIfFalse

condition: An expression whose value is used as a condition.

exprIfTrue: An expression which is executed if the condition is truthy.

exprIfFalse: An expression which is executed if the condition is falsy.

Truthy / Falsy Values

FALSY Values

• false
• 0 (zero)
• "", '', `` (empty strings)
• null
• undefined
• NaN (not a number)

TRUTHY Values

• Everything that is not FALSY

Loops

For Loop

for (st 1; st 2; st3) {
  // code block to be executed
}

• st1 is executed (one time) before the execution of the code block.
• st2 defines the condition for executing the code block.
• st3 is executed (every time) after the code block has been executed.

While Loop

while (condition) {
  // code block to be executed
}

Do While Loop

do {
  // code block to be executed
} while (condition);

For In Loop

for (key in object) {
  // code block to be executed
}

For Of Loop

for (variable of iterable) {
  // code block to be executed
}