Tcl

Eval JavaScript Returning Int

See more JavaScript Examples

Demonstrates getting the completion value of a JavaScript that returns an integer. Tcl

load ./chilkat.dll

set success 0

#  This example demonstrates getting the completion value of a script,
#  where the last evaluated expression is an integer.

#  The Javascript run in this example is shown below.

#  Load the JavaScript from a file.
set sbScript [new_CkStringBuilder]

set success [CkStringBuilder_LoadFile $sbScript "js_eval_return_int.js" "utf-8"]
if {$success == 0} then {
    puts [CkStringBuilder_lastErrorText $sbScript]
    delete_CkStringBuilder $sbScript
    exit
}

set js [new_CkJs]

set result [new_CkJsonObject]

#  Run the JavaScript
#  Eval returns the completion value of the script. This is generally the value of the last evaluated expression.
#  In this case, the last evaluated expression is an int.
set success [CkJs_Eval $js $sbScript $result]
if {$success == 0} then {
    puts [CkStringBuilder_lastErrorText $sbScript]
    delete_CkStringBuilder $sbScript
    delete_CkJs $js
    delete_CkJsonObject $result
    exit
}

CkJsonObject_put_EmitCompact $result 0
puts [CkJsonObject_emit $result]

#  Output:

#  {
#    "type": "int",
#    "value": 42
#  }

delete_CkStringBuilder $sbScript
delete_CkJs $js
delete_CkJsonObject $result

JavaScript

const base = 10;
const multiplier = 4;
const offset = 2;

// The last line is a calculation resulting in an integer
// Returns 42.
(base * multiplier) + offset;