从数组中删除值

Question

I am trying to figure out how if you are adding values to an array and then the same value comes up you have push it to the same array to not push it up and remove the duplicate of the value from the array.

This is my code below:

if (!_.includes(scope.index, val)) {
    scope.index.push(val);
} else {
    _.remove(scope.index, val);
   console.log(scope.index);
}

Answer 1

您必须使用谓词函数调用_.remove() ，该函数检查当前元素是否等于val ：

_.remove(arr, x=> x === val)

Answer 2

It is as simple as this in JS

if ( scope.index.indexOf( val ) != -1 )
{
  scope.index.push( val );
}

To remove the pushed value

var index = scope.index.indexOf( val );
scope.index.splice(index,1);