一道面试题

在James Padolsey的博客里看到一篇面试题。

• Replace the string "The quick brown fox jumps over the lazy dog" with the string "The1 quick2 brown3 fox4 jumps5 over6 the7 lazy8 dog9".

自己写了几种方案：

var foo = " The quick brown fox jumps over the lazy dog " ;
var bar = " The1 quick2 brown3 fox4 jumps5 over6 the7 lazy8 dog9 " ;

function test(func){
var result = func(foo);
console.log(result === bar ? true : result);
}

function custom1(str){
var i = 0 ;
return str.replace( / \w+ / g, function (c){
return c + ++ i;
})
}

function custom2(str){
str = str.split( ' ' );
for ( var i = str.length; i -- ;){
str[i] += i + 1 ;
}
return str.join( ' ' );
}

function custom3(str){
var i = 0 ;
return str.replace( / (?=[\s]|$) / g, function (){
return ++ i;
})
}

test(custom1);
test(custom2);
test(custom3);

但是没想到用Array的map方法，虽然这是javascript高版本才增加的。

" The quick brown fox jumps over the lazy dog " .split( ' ' ).map( function (w,i){ return w + (i + 1 ) }).join( ' ' )

转载于:https://www.cnblogs.com/dishuostec/archive/2011/06/15/2081716.html