Alternative function to str.split() in javascript where you have have the error "TypeError: sentence.split is not a function"

str.split()

function split(sentence){
  var arrayPosition = 0;
  var oneWord = "";
  var newSentence = sentence + " ";
  var split = new Array();
  for(var j = 0; j < newSentence.length; j++){
	if(newSentence[j] === " "){
		split.push(oneWord);
		arrayPosition++;
		oneWord = "";
	}else{
		if(!isNaN(newSentence[j])){
			//don't add to the string
		}else{
			oneWord += newSentence[j];
		}
	}
  }
  return split;
}

function split(str, pattern){
    
    let arr = []
    let index = 0
    
    do {
        index = str.search(pattern)
        if(index != 0 && index != -1) {
            arr.push(str.slice(0, index))
        }
        str = str.slice(index + 1)
    } while(index != -1)
    
    if(str.length > 0) {
        arr.push(str)
    }
    
    return arr
}

console.log(split(' Texto Texto Texto Texto ', ' '))