Code summary for deleting duplicate values ​​in js array_javascript skills

Remove duplicate values ​​from js array

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Method 2

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The code is as follows:

//Deduplicate array
function unique(data){
data = data || [];
var a = {};
len = data.length;
for (var i=0; ivar v = data[i];
if (typeof(a[v]) == 'undefined'){
a[v] = 1;
}
};
data.length= 0;
for (var i in a){
data[data.length] = i;
}
return data;
}

Method 3

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The code is as follows:

var arr = ["123","123", "123","123","sfsdf","123","345","123","123","345","456","567","sdc"];
var str = [];
for(var i = 0,len = arr.length;i < len;i ){
! RegExp(arr[i],"g").test(str.join( ",")) && (str.push(arr[i]));
}
alert(str);

Method 4

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The code is as follows:

var pureMulti1=function(arr){
var obj={};
var a = [];
for(var i=0,l=arr.length;iif(!((arr[i] "") in obj)){
a.push(arr[i]) ;
}
obj[arr[i]]="";
}
return a;
}

<script> Array.prototype.del = function() { var a = {}, c = [], l = this.length; for (var i = 0; i < l; i++) { var b = this[i]; var d = (typeof b) + b; if (a[d] === undefined) { c.push(b); a[d] = 1; } } return c; } alert([1, 1, 2, 3, 4, 5, 4, 3, 4, 4, 5, 5, 6, 7].del()); </script>