按值从数组拼接行

Question

I want splice the line with value = 3

[3,"John", 90909090]

data.json

{
"headers":[[
{"text":"Code","class":"Code"},
{"text":"Code","class":"Code"}
]],
"rows":[
[0,"Peter", 51123123],
[3,"John", 90909090],
[5,"Mary",51123123]
],
"config":[[0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]],
"other":[[13,0]]
}

I try this :

var size = data.rows.length; // number of rows

var del = 3 // Value of ID to be deleted          

for (i = 0; i < size; i++) {  

var id = data.rows[i][0];                  

    if(del==id){  // if del = id -> splice                                         

       data.rows.splice(i,1);

    }

}

Results :

Only splice or only loop this code works.

But, with both show this error:

Uncaught TypeError: Cannot read property '0' of undefined(…)

It occurs in "data.rows[i][0]"

Answer 1

instead of using a for loop, id use the array filter function:

data.rows = data.rows.filter(function(row){
    return row[0] !== del;
});

Answer 2

Just add a break to the condition, because the next element, is the one you have spliced, which is not anymore in the array.

if (del == id) {  // if del = id -> splice
   data.rows.splice(i, 1);
   break; // no more to search
}

Answer 3

You can iterate with Array#forEach() :

 var data = {"headers": [[{"text": "Code","class": "Code"}, {"text": "Code","class": "Code"}]],"rows": [[0, "Peter", 51123123],[3, "John", 90909090],[5, "Mary", 51123123]],"config": [[0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]],"other": [[13, 0]]}, del = 3; // Value of ID to be deleted data.rows.forEach(function(item, index) { item[0] === del && data.rows.splice(index, 1); }); console.log(data.rows); 

 .as-console-wrapper { max-height: 100% !important; top: 0; } 

ES6 :

data.rows.forEach((item, index) => item[0] === del && data.rows.splice(index, 1));

Answer 4

You can use lodash for filter your objects or arrays. Look at the filter method for your case:

var myObject = {
"headers":[[
{"text":"Code","class":"Code"},
{"text":"Code","class":"Code"}
]],
"rows":[
[0,"Peter", 51123123],
[3,"John", 90909090],
[5,"Mary",51123123]
],
"config":[[0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]],
"other":[[13,0]]
};

//filter by lodash
myObject.rows =  _.filter(myObject.rows,function(row){
  return row[0] !== 3;
});