while

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Description

Repeats execution while condition is true.

Syntax

while (condition) expression

Parameters

• condition - any expression that returns a number (0 = false, non-zero = true)
• expression - executed each iteration

Return Value

Value of the last iteration, or void if never executed

Examples

Simple counter

i = 0
while (i < 5) {
    i = i + 1
}
print(i)
# Output: 5

Sum of numbers

sum = 0
i = 1
while (i <= 10) {
    sum = sum + i
    i = i + 1
}
print(sum)
# Output: 55

Array iteration

arr = [10, 20, 30, 40]
i = 0
while (i < length(arr)) {
    print(arr[i])
    i = i + 1
}
# Output:
# 10
# 20
# 30
# 40

Infinite loop (with break condition)

i = 0
while (1) {
    i = i + 1
    if (i >= 10) {
        i
    }
}
print(i)
# Output: 10

Notes

• Loop stops when condition becomes 0
• Maximum 1,000,000 iterations by default (prevents infinite loops)
• Can be nested

See Also

• if/else - conditional execution
• Arrays - iterating collections

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