Conditionals and Loops

if / else

javascript
const score = 75;
if (score >= 70) {
  console.log(\"Passed\");
} else {
  console.log(\"Failed\");
}

Use else if for more branches. Falsy values: false, 0, \"\", null, undefined, NaN. Everything else is truthy.

for loop

javascript
for (let i = 0; i < 5; i++) {
  console.log(i);
}

for...of (iterables)

javascript
const arr = [10, 20, 30];
for (const x of arr) {
  console.log(x);
}

while

javascript
let n = 0;
while (n < 3) {
  console.log(n);
  n++;
}

Use break and continue as in other languages.