jquery version of array.contains

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我在风中等你
我在风中等你 2021-01-30 12:26

Can jQuery test an array for the presence of an object (either as part of the core functionality or via an avaible plugin)?

Also, I\'m looking for something like a

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  • 2021-01-30 13:06

    I found way to remove object:

    foot = { bar : 'test'};
    delete foot[bar];
    
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  • 2021-01-30 13:07

    This is not jQuery, but in one line you can add a handy 'contains' method to arrays. I find this helps with readability (especially for python folk).

    Array.prototype.contains = function(a){ return this.indexOf(a) != -1 }
    

    example usage

     > var a = [1,2,3]
     > a.contains(1)
    true
     > a.contains(4)
    false
    

    Similarly for remove

    Array.prototype.remove = function(a){if (this.contains(a)){ this.splice(this.indexOf(a),1)}; return this}
    
    > var a = [1,2,3]
    > a.remove(2)
    [1,3]
    

    Or, if you want it to return the thing removed rather than the altered array, then

    Array.prototype.remove = function(a){if (this.contains(a)){ return this.splice(this.indexOf(a),1)}}
    
    > var a = [1,2,3]
    > a.remove(2)
    [2]
    > a
    [1,3]
    
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  • 2021-01-30 13:09

    If your list contains a list of elements, then you can use jQuery.not or jQuery.filter to do your "array.remove". (Answer added because of the high google score of your original question).

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  • 2021-01-30 13:33

    jQuery.inArray returns the first index that matches the item you searched for or -1 if it is not found:

    if($.inArray(valueToMatch, theArray) > -1) alert("it's in there");
    

    You shouldn't need an array.remove. Use splice:

    theArray.splice(startRemovingAtThisIndex, numberOfItemsToRemove);
    

    Or, you can perform a "remove" using the jQuery.grep util:

    var valueToRemove = 'someval';
    theArray = $.grep(theArray, function(val) { return val != valueToRemove; });
    
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