Loops and ranges in Julia

start:stop and start:step:stop drive for; while guards.

# Ranges are first-class: start:stop and start:step:stop.
for pass in 1:4
    println("Guiding pass $pass")
end

for alt in 80:-15:35
    println("Slewing through $alt degrees")
end

# while loops on a condition; global mutation is explicit in scripts.
battery = 100
while battery > 70
    global battery -= 12
end
println("Battery at $battery%")

How it works

1. 1:4 is a real value, iterated directly.
2. 80:-15:35 counts down by fifteens.
3. In a script, mutating a loop-external binding takes global.

Keywords and builtins used here

• end
• for
• global
• in
• while

The run, in numbers

Lines

15

Characters to type

334

Tokens

54

Three-star pace

70 tpm

At the three-star pace of 70 tokens a minute, this run takes about 46 seconds.

Type this snippet

Step 2 of 3 in Control flow, step 5 of 27 in Language basics.

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