One line of code implements array de-weight (ES6)

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1. The Set data structure is new in

2. ES6, similar to an array, but   its members are unique   its constructors can accept an array as an argument, such as:

     let array = [1, 1, 1, 1, 2, 3, 4, 4, 5, Span class= "Hljs-number" >3]; let set = new Set (array); console.log (set); //= = Set {1, 2, 3, 4, 5}     

4. Arraya static method has been added to the ES6 to Array.from convert an array-like object into arrays, such as through querySelectAll methods HTML DOM Node List , as well as new Set and Map other traversed objects in the ES6, such as:

   let set = new Set(); set.add(1).add(2).add(3); let array = Array.from(set); console.log(array); // => [1, 2, 3]

So now we can use a line of code to achieve the weight of the array:

let array = Array.from(new Set([1, 1, 1, 2, 3, 2, 4]));console.log(array);// => [1, 2, 3, 4]

Attached: ES5 implementing array de-weight

var array = [1, ‘1‘, 1, 2, 3, 2, 4];var tmpObj = {};var result = [];array.forEach(function(a) { var key = (typeof a) + a; if (!tmpObj[key]) { tmpObj[key] = true; result.push(a); }});console.log(result);// => [1, "1", 2, 3, 4]

One line of code implements array de-weight (ES6)