javascript Check file type

Source: https://stackoverflow.com/questions/7977084/check-file-type-when-form-submit

function getExtension(filename) {
    var parts = filename.split('.');
    return parts[parts.length - 1];
}

function isImage(filename) {
    var ext = getExtension(filename);
    switch (ext.toLowerCase()) {
    case 'jpg':
    case 'gif':
    case 'bmp':
    case 'png':
        //etc
        return true;
    }
    return false;
}

function isVideo(filename) {
    var ext = getExtension(filename);
    switch (ext.toLowerCase()) {
    case 'm4v':
    case 'avi':
    case 'mpg':
    case 'mp4':
        // etc
        return true;
    }
    return false;
}

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