I have a 2D array of certain coordinates :
var array = [ [5, 34], [31, 82], [10, 31], [25, 24] ]
Now I want to remove some pairs of coordinates from the array. Let's say I don't need [31, 82]. How do I remove this element from the array? I tried this :
var coords = [31, 82];
let index = arr.indexOf(coords);
if (index !== -1) arr.splice(index, 1);
But it doesn't work.
You can simply do this by iterating over the array and comparing the corresponding values. Please find below the working code:
var array = [ [5, 34], [31, 82], [10, 31], [25, 24] ]
var coords = [31, 82];
const newarr = array.filter((item) => {
return !(item[0] == coords[0] && item[1] === coords[1]);
});
console.log(newarr);you cannot use indexof in this scenario. Use custom function to do so,
var array = [ [5, 34], [31, 82], [10, 31], [25, 24] ]
function indexOf(array, item) {
for (var i = 0; i < array.length; i++) {
// This if statement depends on the format of your array
if (array[i][0] == item[0] && array[i][1] == item[1]) {
return i; // Found it
}
}
return -1; // Not found
}
console.log(indexOf(array, [31,82]))Then you can splice it by index.
var array = [ [5, 34], [31, 82], [10, 31], [25, 24] ]
function remove(array, item) {
for (var i = 0; i < array.length; i++) {
// This if statement depends on the format of your array
if (array[i][0] == item[0] && array[i][1] == item[1]) {
array.splice(i, 1);
return array
}
}
return array; // Not found
}
console.log(remove(array, [31,82]))Edited
You can also remove element then and there you found it :
If you want remove only the first element find, you can use every and return false to stop the loop. ;)
// usage: <array>.every(removeFirstCoordFound, <coord>)
function removeFirstCoordFound(val, i, arr, coord) {
if (val[0] === this[0] && val[1] === this[1]) {
return !arr.splice(i, 1)
}
return true;
}
const array = [ [5, 34], [31, 82], [10, 31], [25, 24] ]
const coord = [31, 82];
console.log(JSON.stringify(array))
console.log('search', JSON.stringify(coord))
array.every(removeFirstCoordFound, coord)
function removeFirstCoordFound(val, i, arr, coord) {
console.log(i)
if (val[0] === this[0] && val[1] === this[1]) {
return !arr.splice(i, 1)
}
return true
}
console.log('stop')
console.log(JSON.stringify(array))Minified version:
array.every((v,i)=>!(v[0]==coord[0]&&v[1]==coord[1]&&!array.splice(i,1))
Please try this code to,how to remove an array from a 2D array?
function filteredArray(arr, elem) {
let newArr = [];
// change code below this line
for(var i=0; i<arr.length; i++){
if(arr[i].indexOf(elem) === -1){
for(var j=0; j<arr[i].length; j++){
if(arr[i][j] === elem){
arr.splice((i,j), 1);
}
}
newArr.push(arr[i]);
}
else{
newArr.push(arr[i]);
}
}
// change code above this line
return newArr;
}
i hope this code will be usefull for you. Thank you.
