Iterating a dictionary in Mojo

items() yields entries that carry both halves of the pair.

def main():
    var scores = Dict[String, Int]()
    scores["ada"] = 91
    scores["alan"] = 84
    scores["grace"] = 97
    var total = 0
    for entry in scores.items():
        print(entry.key, "scored", entry.value)
        total += entry.value
    print("total", total)

How it works

1. for entry in scores.items(): walks every pair once.
2. entry.key and entry.value read the two sides.
3. The loop prints each score and accumulates the total.

Keywords and builtins used here

• Int
• String
• def
• for
• main
• print
• var

The run, in numbers

Lines

10

Characters to type

230

Tokens

75

Three-star pace

80 tpm

At the three-star pace of 80 tokens a minute, this run takes about 56 seconds.

Type this snippet

Step 4 of 6 in Collections, step 15 of 26 in Language basics.

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