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

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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