let primes = [2, 3, 5, 7]; // An array of 4 values, delimited with [ and ]. primes[0] // => 2: the first element (index 0) of the array. primes.length // => 4: how many elements in the array. primes[primes.length-1] // => 7: the last element of the array. prim...
// In strict mode, all these deletions throw TypeError instead of returning false delete Object.prototype // => false: property is non-configurable var x = 1; // Declare a global variable delete globalThis.x // => false: can't delete this property function f() {} // Declare a global...
};// put all the coffee types and sizes into arraysvarcoffeeTypes = [columbian, frenchRoast, decaf];varcoffeeSizes = [small, medium, large];// build new objects that are combinations of the above// and put them into a new arrayvarcoffees = coffeeTypes.reduce(function(previous, current)...
如果ownDesc.[[Writable]]是false,则返回false。这意味着任何不可写的属性P(自有的或继承的)都会阻止赋值。 让existingDescriptor为Receiver.[[GetOwnProperty]](P)。也就是说,检索赋值开始的属性的描述符。现在我们有: 当前对象O和当前属性描述符ownDesc。 原始对象Receiver和另一方面的原始属性描述符existingDescript...
Return a new array with the square root of all element values: constnumbers = [4,9,16,25]; constnewArr = numbers.map(Math.sqrt) Try it Yourself » Multiply all the values in an array with 10: constnumbers = [65,44,12,4]; ...
Multiply each element: constnumbers = [65,44,12,4]; numbers.forEach(myFunction) functionmyFunction(item, index, arr) { arr[index] = item *10; } Try it Yourself » Array Tutorials: Array Tutorial Array Const Basic Array Methods
array.findIndex() array.map() array.filter() array.reduce() array.sort() array.splice() Nested arrays What is an array? An array is simplya list of values. Here is what an array looks like in JavaScript: varmyArray=['String',8,true,myFunction()]; ...
document.getElementById("sampleDemo2").innerHTML = "The even numbered elements in array are " + evenValues; var simpleProduct = basicNumbers.reduceRight(multiply); document.getElementById("sampleDemo3").innerHTML = "The product by using reduce is " + simpleProduct; ...
Possible Values:"tint"|"replace"|"multiply" forBinning Boolean optional Indicates whether the generated renderer is for a binning visualization. If true, then the input field(s) in this method should refer to aggregate fields defined in the featureReduction property of the layer. signal ...
If this property is not specified, all the sublayers from the service are displayed as defined in the service. If an empty array is passed to this property then none of the sublayers from the service are displayed in the layer. All sublayers are referenced in the order in which they ...