將兩個數據數組組合並修改爲一個數組

Question

請考慮這個示例jsfiddle。在這個例子中我想了var數據陣列

[4,3], 
[4,4], 
[6, 6], 
[6, 7], 
[7,8], 
[7,9], 
[8,10], 
[8,11] 

作爲

[4,3,4], 
[6,6,7], 
[7,8,9], 
[8,10,11] 

我想要的[X，Y]字段被修改以[X，Y1，Y2]進行修改。這個怎麼做 ？

Answer 1

//Original data 
var data = [[4,3], 
[4,4], 
[6, 6], 
[6, 7], 
[7,8], 
[7,9], 
[8,10], 
[8,11]] 

//Group data by x coordinate in an object 
var intermediate = {}; 

for(var i = 0; i < data.length; i++){ 
    intermediate [data[i][0]] = (intermediate [data[i][0]] || []).concat(data[i][1]); 
} 

//Convert intermediate object to array 
var result = []; 

for(var i in intermediate){ 
     result.push([parseInt(i)].concat(intermediate[i])); 
} 

編輯：更改數據的其他方式：

var data = [[4,3,4],[6,6,7],[7,8,9],[8,10,11]]; 
var result = []; 

data.forEach(function(row){ 
    row.slice(1).forEach(function(cell){ 
     result.push([row[0], cell]); 
    }); 
}); 

Answer 2

var result = []; 
var arr = [[4,3], [4,4],[6, 6],[6, 7],[7,8],[7,9],[8,10],[8,11]]; 
for(var i = 0;i< arr.length;i+=2){ 
    result.push([arr[i][0], arr[i][1], arr[i+1][1]]) 
}