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function verifyCustomHeaders(optionsResponse,originalHeaders){
    const accessControlAllowHeader=optionsResponse.headers.find(header=>header.key.toLowerCase()==='access-control-allow-headers')
    const originalHeadersArray=originalHeaders.split(', ')

    if(!accessControlAllowHeader){
        console.error('header "Access-Control-Allow-Headers" missing in option request')
    }else{
        const missingInaccessControlAllowHeader=originalHeadersArray.filter(n => !accessControlAllowHeader.value.split(', ').includes(n))
        if(missingInaccessControlAllowHeader.length>0){
            console.error(`missing "${missingInaccessControlAllowHeader.join(', ')}" "Access-Control-Allow-Headers"`)

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Example Collapsible Content

Style 1

Click to see more: Given the following python code from pychartjs import BaseChart class myChart(BaseChart):

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Homebrew build logs for macvim on macOS 10.15
Build date: 2019-10-26 14:16:41

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const validator = {
  getMessage(field, args) {
    return `The field ${field} is not a valid RUT`;
  },
  validate(value, args) {
    const toValidate=value.slice(-1).toUpperCase();
    let validador=11-rut.toString().split('').reverse().reduce((sum,el,i)=>sum+=el*(i%6+2),0)%11;
    validador==10?'K':validador;
    return validador===toValidate;
  }

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export default function(rut){
  const toValidate=rut.slice(-1).toUpperCase();
  let validador=11-rut.toString().split('').reverse().reduce((sum,el,i)=>sum+=el*(i%6+2),0)%11;
  validador==10?'K':validador;
  return validador===toValidate;
}