zip

zip() pairs up items from two (or more) lists by position, so you can loop over them together.

names = ["John", "David"]
ages = [25, 30]

for name, age in zip(names, ages):
    print(name, age)

John 25
David 30

JS/TS has no built-in equivalent — you'd normally loop by index instead:

const names = ['John', 'David'];
const ages = [25, 30];

for (let i = 0; i < names.length; i++) {
  console.log(names[i], ages[i]);
}

zip() reads more directly ("loop over these two lists together") instead of managing an index manually.

Uneven lengths

If the lists aren't the same length, zip() just stops at the shorter one — it doesn't raise an error:

names = ["John", "David", "Sam"]
ages = [25, 30]

list(zip(names, ages))
# [("John", 25), ("David", 30)]  — "Sam" is silently dropped