文字をJavascriptで1つのスペースで動かすには？

Question

は例えば、私はこれだ：
_T___
をそして私は1つのスペースでTのフォワードを移動し、このような次の文字を破壊したい：
__T__
それは可能ですか？可能であれば、どうやってJavascriptを使ってこれを行うことができますか？どうもありがとう！もちろん

Answer 1

を"T"が入る。

function positionT(index, length){ 
    var str = ''; 
    for(var i=0; i< length; i++){ 
    if(i===index){ 
     str+='T' 
    } else { 
     str+='_' 
    }} 
    return str; 
} 

positionT(1,5) // returns "_T___" 
positionT(2,5) // returns "__T__" 

Answer 2

var str = 'T____'; 
 

 
let i=5; 
 
while(i--){ 
 
    console.log(i, str=moveLetter(str)); 
 
} 
 

 

 
function moveLetter(str){ 
 
    return str.replace(/^(.*?)([^_])(.)(.*)$/,"$1$3$2$4") 
 
}

あなたは、新しい（ES6）の方法たい場合：あなたが望む位置指定した文字列を返す関数を作る

let str = '_T____', 
 
    len = str.length; 
 

 
function moveLetter(str) { 
 
    let arr = str.split(''), 
 
    pos = str.search(/[^_]/); 
 
    
 
    // swap array elements 
 
    [arr[pos], arr[pos+1]] = [arr[pos+1], arr[pos]]; 
 
    return arr.join(''); 
 
} 
 

 
while (len--) 
 
    console.log(len, str = moveLetter(str));

Answer 3

var mystring = "1234T56"; 
 
console.log("Before:", mystring); 
 
var indexOfT = mystring.indexOf("T"); //Get where t is in the string 
 
mystring = mystring.split("T").join(''); //remove the t from the string 
 
mystring = mystring.split(''); // turn string into an array 
 
mystring[indexOfT] = 'T'; //add T back in one index down 
 
mystring = mystring.join(''); //return the array to a string 
 
console.log("After:", mystring);

Answer 4

// To "destroy" the next letter and insert a default "_" where the "T" was: 
 
console.log("abcdTefg".replace(/T.?/, "_T")) 
 
console.log("____T___".replace(/T.?/, "_T")) 
 
// The ? in the regex allows for the "T" being at the end: 
 
console.log("_______T".replace(/T.?/, "_T")) 
 

 
// To simply swap the "T" with the character that follows: 
 
console.log("abcdTefg".replace(/T(.)/, "$1T")) 
 
console.log("____T___".replace(/T(.)/, "$1T")) 
 
// No change if "T" is at the end, because there's no letter to swap with: 
 
console.log("abcdefgT".replace(/T(.)/, "$1T"))