js find the maximum and minimum values in an array All In One

js 找出数组中的最大值与最小值 All In One

number / number string

build in methods Math.max & Math.min

const arr =  [9, 1, 3, 7, 12, 37, 23];

const max = Math.max(...arr);
const min = Math.min(...arr);

console.log(`max =`, max);
console.log(`min =`, min);
// max = 37
// min = 1

const arr =  ['9', '1', '3', '7', '12', '37', '23'];

const max = Math.max(...arr);
const min = Math.min(...arr);

// OR
const max = Math.max(...arr.map(Number));
const min = Math.min(...arr.map(Number));

console.log(`max =`, max);
console.log(`min =`, min);
// max = 37
// min = 1

sort

const arr =  [9, 1, 3, 7, 12, 37, 23];

// arr.sort();
// [1, 12, 23, 3, 37, 7, 9] ❌

//  arr.sort((a, b) => a -  b > 0 ? 1 :  -1);
//  [1, 3, 7, 9, 12, 23, 37] ✅

arr.sort((a, b) => a -  b);
//  [1, 3, 7, 9, 12, 23, 37] ✅

const max = arr[arr.length - 1];
const min = arr[0];

console.log(`max =`, max);
console.log(`min =`, min);
// max = 37
// min = 1

string

not work for string ❌

const arr =  ['c', 'b', 'a', 'c1', 'b2', 'a3', 'abc'];

const max = Math.max(...arr);
const min = Math.min(...arr);

console.log(`max =`, max);
console.log(`min =`, min);

// max = NaN
// min = NaN

custom sort function ✅

const arr =  ['c', 'b', 'a', 'c1', 'b2', 'a3', 'abc'];

// dict

'c'.charCodeAt(0);
// 99

'cba'.charCodeAt(2);
// 97


'cba'.charAt();
// 'c'
'cba'.charAt(2);
// 'a'

String.fromCharCode(97, 98, 99);
// 'abc'

refs

numbers ✅

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/max

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/min

strings / chars

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/fromCharCode

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标签：arr,const,min,max,37,maximum,js,minimum,Math
From： https://www.cnblogs.com/xgqfrms/p/16737535.html