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This page reflects what’s currently implemented in the interpreter (alpha). If something here behaves differently, please file an issue.

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Testing

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assert(condition[, message])

Asserts that a condition is true. 
query assert(1 + 1 == 2)
query assert(2 + 2 == 5, "math is broken")
  • condition must be a boolean.
  • message (optional) must be a string.

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assert_eq(a, b)

Asserts that two values are equal. 
query assert_eq(2 + 2, 4)

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Output

Prints values to stdout (space-separated) and returns nil. 
query print("hello", 123, [1, 2, 3])

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Lists and strings

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count(list)

Returns the number of elements in a list. 
query count([10, 20, 30])  // 3

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first(list) / last(list)

Returns the first/last element of a list. If the list is empty, returns nil. 
query first([10, 20, 30])
query last([10, 20, 30])
query first([])            // nil

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length(x)

Returns the length of a list or a string. 
query length([1, 2, 3])
query length("tide")

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Math

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sum(list)

Sums numeric elements of a list and returns an integer. 
query sum([1, 2, 3, 4])
query sum(1..100)

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abs(x)

Absolute value. 
query abs(-5)

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min(a, b) / max(a, b)

Returns the minimum/maximum of two numbers. 
query min(10, 20)
query max(10, 20)

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min(list) / max(list)

Returns the minimum/maximum element of a list. If the list is empty, returns nil. 
query min([3, 1, 2])
query max([3, 1, 2])
query max([])  // nil