(Ruby) Call a JavaScript Function Returning an Array

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

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require 'chilkat'

success = false

# ----------------------------------------------------------------------------------
# The Javascript functions called in this example are shown at the bottom of this page.
# -----------------------------------------------------------------------------------

sbScript = Chilkat::CkStringBuilder.new()
success = sbScript.LoadFile("js_function_returning_array.js","utf-8")
if (success == false)
    print sbScript.lastErrorText() + "\n";
    exit
end

js = Chilkat::CkJs.new()

result = Chilkat::CkJsonObject.new()
result.put_EmitCompact(false)

# Call Eval to add the function to the context's global object
success = js.Eval(sbScript,result)
if (success == false)
    # Examine the result for an exception.
    print result.emit() + "\n";

    # Also examine the LastErrorText.
    print js.lastErrorText() + "\n";
    exit
end

# ------------------------------------------------------------------------------
# Call each function

funcCall = Chilkat::CkJsonObject.new()

# Create JSON specifying the function name and arguments
# The function has no arguments, so we only specify the name.

funcCall.UpdateString("name","getDays")

success = js.CallFunction(funcCall,result)
if (success == false)
    # Examine the result for an exception.
    print result.emit() + "\n";

    # Also examine the LastErrorText.
    print js.lastErrorText() + "\n";
    exit
end

print result.emit() + "\n";

# Output:
# {
#   "type": "array",
#   "value": [
#     "Monday",
#     "Tuesday",
#     "Wednesday",
#     "Thursday",
#     "Friday"
#   ]
# }

# Access each array value..
count = result.SizeOfArray("value")
i = 0
while i < count
    result.put_I(i)
    print result.stringOf("value[i]") + "\n";
    i = i + 1
end

# ------------------------------------------------------------------------------
# Call the getRange(start,end) function

funcCall.Clear()
funcCall.UpdateString("name","getRange")
funcCall.UpdateInt("args[0]",14)
funcCall.UpdateInt("args[1]",21)
success = js.CallFunction(funcCall,result)
print result.emit() + "\n";

# Output:
# {
#   "type": "array",
#   "value": [
#     14,
#     15,
#     16,
#     17,
#     18,
#     19,
#     20,
#     21
#   ]
# }

count = result.SizeOfArray("value")
i = 0
while i < count
    result.put_I(i)
    print result.IntOf("value[i]").to_s() + "\n";
    i = i + 1
end

# ------------------------------------------------------------------------------
# Call the getEmployees() function

funcCall.Clear()
funcCall.UpdateString("name","getEmployees")
success = js.CallFunction(funcCall,result)
print result.emit() + "\n";

# Output:
# {
#   "type": "array",
#   "value": [
#     {
#       "id": 101,
#       "name": "Alice",
#       "role": "Dev"
#     },
#     {
#       "id": 102,
#       "name": "Bob",
#       "role": "Manager"
#     }
#   ]
# }

count = result.SizeOfArray("value")
i = 0
while i < count
    result.put_I(i)
    print "name: " + result.stringOf("value[i].name") + "\n";
    print "role: " + result.stringOf("value[i].role") + "\n";
    print "id: " + result.IntOf("value[i].id").to_s() + "\n";
    print "" + "\n";
    i = i + 1
end

function getDays() {
    return ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday"];
}

function getRange(start, end) {
    var arr = [];
    for (var i = start; i <= end; i++) {
        arr.push(i);
    }
    return arr;
}
// Usage: getRange(1, 5) -> [1, 2, 3, 4, 5]

function getEmployees() {
    return [
        { id: 101, name: "Alice", role: "Dev" },
        { id: 102, name: "Bob", role: "Manager" }
    ];
}