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| == Boolean functions ==
| | #REDIRECT [[Internal_functions#Boolean_functions]] |
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| These functions return true or false, if the condition that they test holds or not, respectively.
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| * {{ScriptFunction|IsBool||IsBool(var)}}
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| : Tests if ''var'' is of the bool type. ''var'' can be any expression allowed by the [[AviSynth Syntax]].
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| : ''Examples:''
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| b = false
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| IsBool(b) = true
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| IsBool(1 < 2 && 0 == 1) = true
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| IsBool(123) = false
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| * {{ScriptFunction|IsClip||IsClip(var)}}
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| : Tests if ''var'' is of the clip type. ''var'' can be any expression allowed by the [[AviSynth Syntax]].
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| : ''Examples:''
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| c = [[AviSource]](...)
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| IsClip(c) = true
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| IsClip("c") = false
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| * {{ScriptFunction|IsFloat||IsFloat(var)}}
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| : Tests if ''var'' is of the float type. ''var'' can be any expression allowed by the [[AviSynth Syntax]].
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| : ''Examples:''
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| f = [[Internal_functions/Numeric_functions|Sqrt]](2)
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| IsFloat(f) = true
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| IsFloat(2) = true # ints are considered to be floats by this function
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| IsFloat(true) = false
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| * {{ScriptFunction|IsInt||IsInt(var)}}
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| : Tests if ''var'' is of the int type. ''var'' can be any expression allowed by the [[AviSynth Syntax]].
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| : ''Examples:''
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| IsInt(2) = true
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| IsInt(2.1) = false
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| IsInt(true) = false
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| * {{ScriptFunction|IsString||IsString(var)}}
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| : Tests if ''var'' is of the string type. ''var'' can be any expression allowed by the [[AviSynth Syntax]].
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| : ''Examples:''
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| IsString("test") = true
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| IsString(2.3) = false
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| IsString([[Internal_functions/Conversion_functions|String]](2.3)) = true
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| * {{ScriptFunction|Exist|v2.07|Exist(filename)}}
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| : Tests if the file specified by ''filename'' exists.
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| : ''Examples:''
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| filename = ...
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| clp = Exist(filename) ? [[AviSource]](filename) : [[Internal_functions/Control_functions|Assert]](false, "file: " + filename + " does not exist")
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| * {{ScriptFunction|Defined||Defined(var)}}
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| : Tests if ''var'' is defined. Can be used inside [[Script_functions]] to test if an optional argument has been given an explicit value.
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| : More formally, the function returns false if its argument (normally a function argument or variable) has the void ('undefined') type, otherwise it returns true.
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| : ''Examples:''
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| b_arg_supplied = Defined(arg)
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| myvar = b_arg_supplied ? ... : ...
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| ----
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| Back to [[Internal functions]].
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| [[Category:AviSynth_Syntax]] | | [[Category:AviSynth_Syntax]] |
| [[Category:Scripting_Basics]] | | [[Category:Scripting_Basics]] |
