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# IO.write

Writes the string to the specified file. If the file does not exist, it is created.

    IO.write(fileName, fileContent, append, charset);

## Arguments

Name | Description
--- | ---
filename | (string) The absolute path of the file.
fileContent | (string) String to write to the file.
append(Optional) | (boolean) Indicates whether to append the string or overwrite the existing file contents: true. Append the string to the end of the file (default). false. Overwrite the file with the string.
charset(Optional) | (string) The charset of the file, if it is not UTF-8. Supported charsets: ['binary', 'UTF-8', 'UTF-16', 'base64', 'ANSI']

## Return value

A promise fulfilled with true upon success.

## Example

Copy code

    (async ()=>{
        let ret = await IO.write("file_path", "This is first line\n", false);
    })();

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