Remove array element based on object property

Remove array element based on object property

I have an array of objects like so:
var myArray = [
{field: ‘id’, operator: ‘eq’, value: id},
{field: ‘cStatus’, operator: ‘eq’, value: cStatus},
{field: ‘money’, operator: ‘eq’, value: money}
];

How do I remove a specific one based on its property?
e.g. How would I remove the array object with ‘money’ as the field property?

Solutions/Answers:

Solution 1:

One possibility:

myArray = myArray.filter(function( obj ) {
    return obj.field !== 'money';
});

Please note that filter creates a new array. Any other variables referring to the original array would not get the filtered data although you update your original variable myArray with the new reference. Use with caution.

Solution 2:

Iterate through the array, and splice out the ones you don’t want. For easier use, iterate backwards so you don’t have to take into account the live nature of the array:

for (var i = myArray.length - 1; i >= 0; --i) {
    if (myArray[i].field == "money") {
        myArray.splice(i,1);
    }
}

Solution 3:

Say you want to remove the second object by it’s field property.

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With ES6 it’s as easy as this.

myArray.splice(myArray.findIndex(item => item.field === "cStatus"), 1)

Solution 4:

You can use lodash’s findIndex to get the index of the specific element and then splice using it.

myArray.splice(_.findIndex(myArray, function(item) {
    return item.value === 'money';
}), 1);

Update

You can also use ES6’s findIndex()

The findIndex() method returns the index of the first element in the array that satisfies the provided testing function. Otherwise -1 is returned.

myArray.splice(myArray.findIndex(myArray, function(item) {
    return item.value === 'money';
}), 1);

Solution 5:

Here’s another option using jQuery grep. Pass true as the third parameter to ensure grep removes items that match your function.

users = $.grep(users, function(el, idx) {return el.field == "money"}, true)

If you’re already using jQuery then no shim is required, which is could be useful as opposed to using Array.filter.

Solution 6:

Following is the code if you are not using jQuery. Demo

var myArray = [
    {field: 'id', operator: 'eq', value: 'id'}, 
    {field: 'cStatus', operator: 'eq', value: 'cStatus'}, 
    {field: 'money', operator: 'eq', value: 'money'}
];

alert(myArray.length);

for(var i=0 ; i<myArray.length; i++)
{
    if(myArray[i].value=='money')
        myArray.splice(i);
}

alert(myArray.length);

You can also use underscore library which have lots of function.

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Underscore is a utility-belt library for JavaScript that provides a lot of the functional programming support