js++全修班-->53.数组去重（1）
53数组去重若干方法1
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>53数组去重若干方法</title>
</head>
<body>
<script>
let arr = [1,2,3,4,44,42,21,3,3,2,4,5,5,3,2,2]
function uniqueArr(array) {
let _arr = [],
isRepeat;
for (let i = 0; i < array.length; i++) {
isRepeat = false;
for (let j = 0; j < _arr.length; j++) {
if (_arr[j] === array[i]){
isRepeat = true
break;
}
}
if (!isRepeat){
_arr.push(array[i])
}
}
return _arr.sort((a,b)=>{
return a-b
})
}
console.log(uniqueArr(arr));
</script>
</body>
</html>
53数组去重若干方法2
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>53数组去重若干方法2</title>
</head>
<body>
<script>
let arr = [1,2,3,4,44,42,21,3,3,2,4,5,5,3,2,2]
function uniqueArr(array) {
return array.filter(function (item,index) {
return array.indexOf(item) === index
})
}
let newArr = uniqueArr(arr).sort(function (a,b) {
return a-b
});
console.log(newArr);
</script>
</body>
</html>
53数组去重若干方法3
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>53数组去重若干方法3</title>
</head>
<body>
<script>
let arr = [1,2,3,4,44,42,21,3,3,2,4,5,5,3,2,2]
function uniqueArr(array) {
return array.filter(function (item,index) {
return array.indexOf(item) === index
})
}
let newArr = uniqueArr(arr).sort(function (a,b) {
return a-b
});
console.log(newArr);
</script>
</body>
</html>
53数组去重若干方法4
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>53数组去重若干方法4</title>
</head>
<body>
<script>
let arr = [1, 2, 3, 4, 44, 42, 21, 3, 3, 2, 4, 5, 5, 3, 2, 2]
function uniqueArr(array) {
let _arr = []
array.forEach(function (item) {
if (!_arr.includes(item)){
_arr.push(item)
}
})
return _arr
}
let newArr = uniqueArr(arr).sort(function (a, b) {
return a - b
});
console.log(newArr);
</script>
</body>
</html>
53数组去重若干方法5
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>53数组去重若干方法2</title>
</head>
<body>
<script>
let arr = [1, 2, 3, 4, 44, 42, 21, 3, 3, 2, 4, 5, 5, 3, 2, 2]
function uniqueArr(array) {
return array.sort(function (a, b) {
return a - b
}).reduce(function (prev,item) {
if (prev.length === 0 || prev[prev.length - 1] !== item){
prev.push(item)
}
return prev
},[]);
}
console.log(uniqueArr(arr));
</script>
</body>
</html>
53数组去重若干方法6
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>53数组去重若干方法6</title>
</head>
<body>
<script>
let arr = [1, 2, 3, 4, 44, 42, 21, 3, 3, 2, 4, 5, 5, 3, 2, 2]
function uniqueArr(array) {
let _arr = [],
_temp = new Map()
for (let i = 0; i < array.length; i++) {
if (!_temp.get(array[i])){
_temp.set(array[i],1)
_arr.push(array[i])
}
}
return _arr
}
let newArr = uniqueArr(arr).sort(function (a, b) {
return a - b
});
console.log(newArr);
</script>
</body>
</html>
53数组去重若干方法7
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>53数组去重若干方法2</title>
</head>
<body>
<script>
let arr = [1, 2, 3, 4, 44, 42, 21, 3, 3, 2, 4, 5, 5, 3, 2, 2]
function uniqueArr(array) {
let _arr = [],
_temp = {}
for (let i = 0; i < array.length; i++) {
if (!_temp[array[i]]){
_temp[array[i]] = 1
_arr.push(array[i])
}
}
return _arr
}
let newArr = uniqueArr(arr).sort(function (a, b) {
return a - b
});
console.log(newArr);
</script>
</body>
</html>
53数组去重若干方法8
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>53数组去重若干方法2</title>
</head>
<body>
<script>
let arr = [1, 2, 3, 4, 44, 42, 21, 3, 3, 2, 4, 5, 5, 3, 2, 2]
function uniqueArr(array) {
return Array.from(new Set(array))
}
let newArr = uniqueArr(arr).sort(function (a, b) {
return a - b
});
console.log(newArr);
</script>
</body>
</html>
