// function return if an element is found in the array, else falsefunctioncheckTrueExistsArray(array) {for(vark=0;k<array.length;k++) {if(array[k]) {returntrue;break;}}returnfalse;}vararrayVariable=[false,false,true,false,true];vararrayVariable1=[false,false,false,false,false];console....
includes()Check if an array contains the specified element indexOf()Search the array for an element and returns its position isArray()Checks whether an object is an array join()Joins all elements of an array into a string keys()Returns a Array Iteration Object, containing the keys of the ...
// Function to check if an array contains a specific elementfunctioncontains(arr,element){// Iterate through the arrayfor(vari=0;i<arr.length;i++){// Check if the current element is equal to the target elementif(arr[i]===element){// Return true if the element is found in the array...
If activated 'template', 'content' and 'title' options will be sanitized. whiteList object Default value Object which contains allowed attributes and tags sanitizeFn null | function null Here you can supply your own sanitize function. This can be useful if you prefer to use a dedicated library...
constcastArray=val=>(Array.isArray(val)?val:[val]);castArray('foo');// ['foo']castArray([1]);// [1]castArray(1);// [1] 10. `compact`:去除数组中的无效/无用值 代码语言:javascript 复制 constcompact=arr=>arr.filter(Boolean);compact([0,1,false,2,'',3,'a','e'*23,NaN,'...
// check if object contains entry with this element as key if(map[arr[i]]) { result = true; // terminate the loop break; } // add entry in object with the element as key map[arr[i]] = true; } if(result) { document.write('Array contains duplicate elements'); ...
select arrayContainsPropertyValue('[{"name":"Fred", "beers":2}, {"name":"Scott", "beers":3}, {"name":"Lenka", "beers":1}]', 'Lenka', 'name') as arrayPropContains; This example is checking if the array contains an object where thenameproperty of an object is “Lenka”. ...
4.8 Use line breaks after opening array brackets and before closing array brackets, if an array has multiple lines // bad const arr = [ [0, 1], [2, 3], [4, 5], ]; const objectInArray = [{ id: 1, }, { id: 2, }]; const numberInArray = [ 1, 2, ]; // good const ...
Tests if an item is present in the new Collection. Parameter searchElement * The item to search for in the collection. Returns TypeDescription Boolean true if the item is in the collection. See also Array.prototype.includes() Example // check if a layer is in the map's operational ...
Like TDD, it uses suite() and test(), but resembling BDD, it also contains before(), after(), beforeEach(), and afterEach(). function ok(expr, msg) { if (!expr) throw new Error(msg); } suite('Array'); test('#length', function() { var arr = [1, 2, 3]; ok(arr.length...