(Tcl) Eval JavaScript Returning Int

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Note: This example requires Chilkat v11.4.0 or greater.

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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

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

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