I use this code
labels.map((label, key) => {
const xAxis = (parseInt(label, 10)).toFixed(0);
const yAxis = parseInt(this.props.dataSet.datasets[0].data[key], 10);
const arrayAxis = [xAxis, yAxis];
data.push(arrayAxis);
return arrayAxis;
});
then i get the data list
["1", 1]
["2", 1] // duplicate
["2", 1] // duplicate
["3", 1]
["4", 1]
["4", 1]
["5", 4]
["6", 4]
["7", 4]
["8", 4]
["9", 4]
.....
....
...
How I can remove duplicate array from the array list using filter?
You could use this with a temporary object for indicating duplicates. It works for non sorted arrays as well.
levels.forEach((temp => (label, key) => {
var xAxis = (parseInt(label, 10)).toFixed(0),
yAxis = parseInt(this.props.dataSet.datasets[0].data[key], 10),
arrayAxis =[ xAxis, yAxis];
if (!temp[arrayAxis]) {
temp[arrayAxis] = true;
data.push(arrayAxis);
}
})(Object.create(null)));
You can do it with filter, but it would be much simpler using lodash's uniqBy and isEqual functions.
_.uniqWith(arr, _.isEqual);
You can read about it here: https://lodash.com/docs#uniqBy https://lodash.com/docs#isEqual
Notice that it does involve adding a dependecy on lodash.
Use this:
var data = [["1", 1],
["2", 1],
["3", 1],
["4", 1],
["5", 4],
["6", 4],
["7", 4],
["8", 4],
["9", 4]];
const xAxis = "2";
const yAxis = 1;
const arrayAxis = [xAxis, yAxis];
if($.inArray(arrayAxis[xAxis], data) !== -1)
{
data.push(arrayAxis);
}
console.log(data);
This code prevents your duplicates.
If possible, I always like to provide a generic answer rather than a tailored one to the specific question.
To me this question is about filtering the array or object items of an array according to not a simple property but a similar array or object. I would use two utility methods those i had used at some other cases previously. Object.prototype.compare() and Array.prototype.compare(). Lets see.
Object.prototype.compare = function(o){
var ok = Object.keys(this);
return typeof o === "object" && ok.length === Object.keys(o).length ? ok.every(k => this[k] === o[k]) : false;
};
Array.prototype.compare = function(a){
return this.every((e,i) => typeof a[i] === "object" ? a[i].compare(e) : a[i] === e);
};
var data = [["1", 1],["2", 1],["2", 1],["3", 1],["4", 1],["4", 1],["5", 4],["6", 4],["7", 4],["8", 4], ["9", 4]],
filtered = data.filter(function(e) { var f = this.find(f => f.compare(e));
return !f ? this.push(e) : void 0;
},[]);
console.log(JSON.stringify(filtered));
let res = [...new Set([1,3,45, 1, 3])]
output is = [1,3,45]
label.