4 examples of 'angular 4 filter array of objects' in JavaScript

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function filterArrayObject(array, filter){
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    var i = 0;
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    // array.length is changing
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    for(; i < array.length; i ++){
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        if(!filter.call(array, array[i], i)){
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            // the member at the iterator has been removed, so we should move the iterator one step to the left
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            array.splice(i --, 1);
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        }
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    }
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    return array;
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};

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function filterObjects(arr) {
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    var queryParams = getQueryParams();
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    return arr.filter(function (obj) {
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        var keep = true;
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        if (("type" in obj) && ("type" in queryParams)) keep = (queryParams["type"] === obj["type"]);
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        if ((keep) && ("uid" in obj) && ("uid" in queryParams)) keep = (queryParams["uid"] === obj["uid"]);
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        return keep;
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    });
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}

21
private filterByObject(filter) {
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  return value => {
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    for (let key in filter) {
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      if (!value.hasOwnProperty(key)) {
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        return false;
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      }
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      const type = typeof value[key];
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      let isMatching;
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      if (type === 'string') {
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        isMatching = this.filterByString(filter[key])(value[key]);
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      } else if (type === 'object') {
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        isMatching = this.filterByObject(filter[key])(value[key]);
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      } else {
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        isMatching = this.filterDefault(filter[key])(value[key]);
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      }
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      if (!isMatching) {
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        return false;
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      }
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    }
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    return true;
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  }
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}

19
function filterArray(arr, filter) {
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    var rtn = [];
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    for (var i = 0; i < arr.length; i++) {
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        if (filter.indexOf(i) > -1) {
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            rtn.push(arr[i]);
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        }
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    }
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    return rtn;
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}