string conversion to hump format--js exercise

Topic Requirements

The function convertToCamelCase of perfecting functions. The function convertToCamelCase converts the passed-in string argument string to the hump format and returns the converted string. The specific requirements are as follows:

• The argument string is a string of words that are concatenated with an underscore (-) to capitalize the first letter of the second non-empty word, such as the result of a-webkit-border-radius conversion of Webkitborderradius.
• Returns the converted String

functionconverttocamelcase (str) {//remove an underscore delimiter to get an array of words  varStrarr = Str.split ('-')); //If the first one is empty, remove the  if(Strarr[0] = = = ") {strarr.shift (); }   //traverse the second word to the last word and convert the first letter of the word to thank you   for(vari = 1, len = strarr.length; i < Len; i++){    //if not empty, turn to uppercase    if(Strarr[i]!== ") {Strarr[i]= Strarr[i][0].touppercase () + strarr[i].substring (1); }     }  returnStrarr.join (' ');}

Note: Check whether the first item is empty

Ideas:

• Remove the underscore connector from the parameter string, where you use the string split method split
• Gets an array of words that remove the underlined connector and saves it in a new variablestrArr
• You need to determine if the first item in the array is empty, or if it is empty. Such as‘-a-b-c‘.split(‘-‘); // 返回的是 [‘‘, a, b, c] 第一项便为空字符串
• Use a looping statement to set the starting coordinates to i = 1 be processed only from the second word
• The first letter of each word is called the string capitalization method toUpperCase
• The first letter of the change and the character after the word are stitched together again to become a new word string
• After looping, the array of words is stitched into a complete string, using an array of methods to join

The knowledge points used are as follows:

• Split String Split

   split()method to split a string into an array of strings. As shown below:

    "2:3:4:5".split(":")    // 将返回 ["2", "3", "4", "5"]    "|a|b|c".split("|") // 将返回 ["", "a", "b", "c"]


 更多： http://www.w3school.com.cn/jsref/jsref_split.asp

• Intercept string substring

    substring()method is used to extract the character of a string that is mediated between two specified subscripts. As shown below:

     var str = ‘Hello World!‘;     console.log(str.substring(3)); // 将返回 lo world!

 为w3school的定义&解释

MORE: http://www.w3school.com.cn/jsref/jsref_substring.asp

• String Conversion Capital toUpperCase ()/toLocaleUpperCase ()

    toLocaleUpperCase()method is used to convert a string to uppercase. As shown below:

     var str = ‘Hello World!‘;     console.log(str.toLocaleUpperCase()); // 将返回 HELLO WORLD!

    更多：http://www.w3school.com.cn/jsref/jsref_toLocaleUpperCase.asp
          http://www.w3school.com.cn/jsref/jsref_toUpperCase.asp

• Splicing string Join ()

Definition and usage

The join () method is used to put all the elements in an array into a string.

The elements are delimited by the specified delimiter.

更多：http://www.w3school.com.cn/jsref/jsref_join.asp

• 更多方法：http://www.w3school.com.cn/jsref/jsref_obj_string.asp

string conversion to hump format--js exercise