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control_flow.fy
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control_flow.fy
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FancySpec describe: "Control Flow" with: {
it: "should NOT call the block if not nil" for: 'if_nil: when: {
'foo if_nil: { 'is_nil } . should == nil
"hello, world" if_nil: { 'is_nil } . should == nil
}
it: "should work like if_true:" for: 'if:then: when: {
if: (4 < 5) then: {
4 < 5 should == true
}
}
it: "should work like if_true:else: " for: 'if:then:else: when: {
if: (4 < 5) then: {
4 < 5 should == true
} else: {
4 < 5 should == nil
}
}
it: "should work like while_true:" for: 'while:do: when: {
x = 0
while: { x < 10 } do: {
x < 10 should == true
x = x + 1
}
x == 10 should == true
}
it: "should work like while_false: " for: 'until:do: when: {
x = 0
until: { x == 10 } do: {
x < 10 should == true
x = x + 1
}
x == 10 should == true
}
it: "should work like if_false:: " for: 'unless:do: when: {
unless: (4 > 5) do: {
5 > 4 should == true
}
}
it: "should only call the block if it's a true-ish value" for: 'if_do: when: {
1 if_do: |num| {
num * 10
} . should == 10
nil if_do: {
"nope"
} . should == nil
false if_do: {
"nope again"
} . should == nil
}
it: "should call the then_block if it's a true-ish value and call the else_block otherwise" for: 'if_do:else: when: {
1 if_do: |num| {
num * 10
} else: {
nil
} . should == 10
nil if_do: {
"nope"
} else: {
"yup"
} . should == "yup"
false if_do: {
"nope again"
} else: {
"yup again"
} . should == "yup again"
}
it: "should break from an iteration" for: 'break when: {
x = 0
until: { x == 10 } do: {
x = x + 1
{ break } if: (x == 5)
}
x == 5 should == true
}
it: "should break from an iteration with return value" for: 'break: when: {
x = 0
y = until: { x == 10 } do: {
x = x + 1
{ break: 42 } if: (x == 5)
}
x should == 5
y should == 42
}
it: "should skip an iteration over a Range" for: 'next when: {
total = 0
(1..10) each: |i| {
{ next } if: (i == 5)
total = total + i
}
total should == 50
}
it: "should skip an iteration over an Array" for: 'next when: {
total = 0
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10] each: |i| {
{ next } if: (i == 5)
total = total + i
}
total should == 50
}
it: "should skip an iteration over an Hash" for: 'next when: {
total = 0
<['a => 1, 'b => 2, 'c => 3, 'd => 4, 'e => 5, 'f => 6]> each: |k v| {
{ next } if: (k == 'd)
total = total + v
}
total should == 17
}
it: "stops any loop type at the correct spot" for: 'break when: {
i = 0
loop: {
{ break } if: (i == 3)
i = i + 1
}
i should == 3
i = 0
while: { i < 5 } do: {
{ break } if: (i == 3)
i = i + 1
}
i should == 3
i = 0
0 upto: 5 do: |n| {
i = n
{ break } if: (n == 3)
}
i should == 3
}
it: "stops any loop type at the correct spot" for: 'break: when: {
i = 0
loop: {
{ break: i } if: (i == 2)
i = i + 1
} . should == 2
i = 0
while: { i < 5 } do: {
{ break: i } if: (i == 2)
i = i + 1
} . should == 2
i = 0
0 upto: 5 do: |n| {
i = n
{ break: n } if: (n == 2)
}
i should == 2
}
it: "should allow empty try blocks" when: {
x = "foo"
try {
} finally {
x should == "foo"
}
}
}