[英]Convert final two digits to a percent value over 60. (e.g., 15 / 60 => .25 etc)
[英]Convert excel column alphabet (e.g. AA) to number (e.g., 25)
在我的網格中,列標題被命名為A,B,C...,AA,AB,AC,...
就像 excel 電子表格一樣。 如何將字符串轉換為數字,如: A => 1, B => 2, AA => 27
嘗試:
var foo = function(val) {
var base = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', i, j, result = 0;
for (i = 0, j = val.length - 1; i < val.length; i += 1, j -= 1) {
result += Math.pow(base.length, j) * (base.indexOf(val[i]) + 1);
}
return result;
};
console.log(['A', 'AA', 'AB', 'ZZ'].map(foo)); // [1, 27, 28, 702]
解決方案 1:最佳性能和瀏覽器兼容性
// convert A to 1, Z to 26, AA to 27
function lettersToNumber(letters){
var chrs = ' ABCDEFGHIJKLMNOPQRSTUVWXYZ', mode = chrs.length - 1, number = 0;
for(var p = 0; p < letters.length; p++){
number = number * mode + chrs.indexOf(letters[p]);
}
return number;
}
解決方案 2:最佳性能和兼容性以及更短的代碼(推薦)
// convert A to 1, Z to 26, AA to 27
function lettersToNumber(letters){
for(var p = 0, n = 0; p < letters.length; p++){
n = letters[p].charCodeAt() - 64 + n * 26;
}
return n;
}
方案三:短代碼(es6箭頭函數)
// convert A to 1, Z to 26, AA to 27
function lettersToNumber(letters){
return letters.split('').reduce((r, a) => r * 26 + parseInt(a, 36) - 9, 0);
}
測試:
['A', 'Z', 'AA', 'AB', 'ZZ','BKTXHSOGHKKE'].map(lettersToNumber);
// [1, 26, 27, 28, 702, 9007199254740991]
lettersToNumber('AAA'); //703
這是您應該實現的代碼的快速示例。 這將適用於任何給定數量的字母。
function letterToNumbers(string) {
string = string.toUpperCase();
var letters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', sum = 0, i;
for (i = 0; i < string.length; i++) {
sum += Math.pow(letters.length, i) * (letters.indexOf(string.substr(((i + 1) * -1), 1)) + 1);
}
return sum;
}
我剛剛寫了一個垃圾場 f@#$ 片段...需要優化.. :)
charToNum = function(alpha) {
var index = 0
for(var i = 0, j = 1; i < j; i++, j++) {
if(alpha == numToChar(i)) {
index = i;
j = i;
}
}
console.log(index);
}
numToChar = function(number) {
var numeric = (number - 1) % 26;
var letter = chr(65 + numeric);
var number2 = parseInt((number - 1) / 26);
if (number2 > 0) {
return numToChar(number2) + letter;
} else {
return letter;
}
}
chr = function (codePt) {
if (codePt > 0xFFFF) {
codePt -= 0x10000;
return String.fromCharCode(0xD800 + (codePt >> 10), 0xDC00 + (codePt & 0x3FF));
}
return String.fromCharCode(codePt);
}
charToNum('A') => 返回 1 和 charToNum('AA') => 返回 27;
我以更詳細的形式重寫了Yoshi 的答案,更好地解釋了它的工作原理,並且更容易移植到其他語言:
var foo = function(val) {
var base = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
var baseNumber = base.length;
var runningTotal = 0;
var characterIndex = 0;
var indexExponent = val.length - 1;
while( characterIndex < val.length ){
var digit = val[characterIndex];
var digitValue = base.indexOf(digit) + 1;
runningTotal += Math.pow(baseNumber, indexExponent) * digitValue;
characterIndex += 1
indexExponent -= 1
}
return runningTotal;
};
console.log(['A', 'AA', 'AB', 'ZZ'].map(foo)); // [1, 27, 28, 702]
// Given Column to Number
function colToNumber(str) {
var num = 0
var i = 0
while (i < str.length ) {
num = str[i].charCodeAt() - 64 + num * 26;
i++;
}
return num;
}
//Given Number to Column name
function numberToCol(num) {
var str = '', q, r;
while (num > 0) {
q = (num-1) / 26;
r = (num-1) % 26
num = Math.floor(a)
str = String.fromCharCode(65 + r) + str;
}
return str;
}
Public Function ColLet2Num(Letras As String)
'RALONSO MAYO 2017
'A-> 1
'OQ ->407
'XFD->16384
Dim UnChar As String
Dim NAsc As Long
Dim F As Long
Dim Acum As Long
Dim Indice As Long
Letras = UCase(Letras)
Acum = 0
Indice = 0
For F = Len(Letras) - 1 To 0 Step -1
UnChar = Mid(Letras, F + 1, 1)
NAsc = Asc(UnChar) - 64
Acum = Acum + (NAsc * (26 ^ Indice))
Indice = Indice + 1
Next
If Acum > 16384 Then
MsgBox "La celda máxima es la XFD->16384", vbCritical
End If
ColLet2Num = Acum
End Function
const getColumnName = (columnNumber) => {
let columnName = "";
const alphabets = "abcdefghijklmnopqrstuvwxyz".toUpperCase();
while (columnNumber > 0) {
const rem = columnNumber % 26;
if (rem === 0) {
columnName += "Z";
columnNumber = columnNumber / 26 - 1;
} else {
columnName += alphabets[rem - 1];
columnNumber = Math.floor(columnNumber / 26);
}
}
return columnName.split("").reverse().join("");
};
console.log(getColumnName(27));
一個良好的可讀性和性能示例:
const letters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
// create dict to O(1) access to letter number
const dict = Object.fromEntries(letters.split('').map((it, index) => [it, index + 1]));
function toNumber(col) {
return col
.toUpperCase()
.split('')
.reduce((acc, letter, index) => acc + Math.pow(letters.length, col.length - (index + 1)) * dict[letter], 0);
}
//fixed the one taken from here
function colToNumber(str: string): number {
var num = 0
for (var i = 0; i < str.length; i++) {
const current_letter = str.charCodeAt(i) - 64
const current_char = str[i]
if (i == str.length - 1) {
num += current_letter
} else {
var current = current_letter * Math.pow(26, str.length - i - 1)
num += current
}
}
return num;
}
//Given Number to Column name (taken from here)
function numberToCol(num: number) {
var str = '', q: number, r: number;
while (num > 0) {
q = (num - 1) / 26;
r = (num - 1) % 26
num = Math.floor(q)
str = String.fromCharCode(65 + r) + str;
}
return str;
}
function test_both() {
const dic = new Map<number, string>()
dic.set(1,"A")
dic.set(10,"J")
dic.set(13,"M")
dic.set(33,"AG")
dic.set(63,"BK")
dic.set(66,"BN")
dic.set(206,"GX")
dic.set(502,"SH")
dic.set(1003,"ALO")
dic.set(100,"CV")
dic.set(10111,"NXW")
dic.set(10001,"NTQ")
dic.set(9002,"MHF")
dic.set(5002,"GJJ")
dic.set(3002,"DKL")
dic.set(16384,"XFD")
for (var key of dic.keys()) {
const expected_a1 = dic.get(key) || ""
//console.log(`${ key }, ${ expected_a1 } `)
var actual = numberToCol(key)
var actual_num = colToNumber(expected_a1)
if (actual.localeCompare(expected_a1) != 0) {
console.error(`key = ${key} == expected=${expected_a1} actual = ${actual} `)
}
if (actual_num != key) {
console.error(`expected = ${expected_a1} key = ${key} == actual = ${actual_num} `)
}
}
}
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