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How to remove duplicate string values in javascript: first open the corresponding front-end code file; then use the hash function of javascript to remove duplicate string values.
The operating environment of this article: Windows 7 system, javascript1.8.5, Dell G3 computer.
How to remove duplicate values from a string in javascript?
javascript removes repeated characters in a string
In javascript, the object is actually a hash table, the attribute name is the key of the hash table, and the value of the attribute is Hash table value.
See more at http://www.nowamagic.net/librarys/veda/detail/759
Use the natural hash function of javascript
<html>
<body>
<script type="text/javascript">
console.log(dropRepeat('abdacda'));
function dropRepeat(str){
var result=[];
var hash={};
for(var i=0, elem; i<str.length;i++){
elem=str[i];
if(!hash[elem]){
hash[elem]=true;
result.push(elem);
}
}
return result;
}
</script>
</body>
</html>The result is ["a ", "b", "d", "c"]
There is also a calculation of the number of occurrences
var str = "dog cat dog mouse dog cat";
function getFrequence(str){
var arr = str.split(" ");
var result = {};
for(var i=0, len=arr.length; i<len;i++){
if(!result[arr[i]]){
result[arr[i]] = 1;
}else{
result[arr[i]] += 1;
}
}
for(var item in result){
console.log(item + " " + result[item]);
// dog 3
// cat 2
// mouse 1
}
}
getFrequence(str);Related video tutorial sharing: javascript advanced video
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