如何检查字符串中的第一个字符以及如何将该字符串发送到 Jquery 中的数组中？

Question

friends.

I have an array and it contains some string values. ex: array name="All_array"

Now i want to check all values in that array for first character of a string.

if a String starts with character 'a' then move that string to array called "A_array". if a String starts with character 'b' then move that string to array called "B_array".

How to achieve this task.

Answer 1

var splitArrays = {};
for(var i = 0; i < All_array.length; ++i){
    var firstChar = All_array[i].substr(0,1).toUpperCase();
    if(!splitArrays[firstChar + '_array'])
        splitArrays[firstChar + '_array'] = [];
    splitArrays[firstChar + '_array'].push(All_array[i]);
}

This will take every element in All_array and put them into an object containing the arrays indexed by the first letter of the elements in All_array , like this:

splitArrays.A_array = ['Abcd','Anej','Aali']

etc...

Here's a fiddle: http://jsfiddle.net/svjJ9/

Answer 2

The code would be this:

for(var i=0; i<All_array.length; i++){
   var firstChar = All_array[i].substr(0, 1).toUpperCase();
   var arrayName = firstChar + "_array";
   if(typeof(window[arrayName]) == 'undefined') window[arrayName] = []; //Create the var if it doesn't exist
   window[arrayName].push(All_array[i]);
}
A_array = []; //empty the array (cause you wanted to 'move')

Hope this helps. Cheers

Answer 3

You could do it using each() and charAt :

$.each(All_array,function(i,s){  
    var c = s.charAt(0).toUpperCase();                
    if(!window[c + '_array']) window[c + '_array'] = [];
    window[c + '_array'].push(s);
});