The source for this interactive example is stored in a GitHub repository. Let len be ToUint32 lenValue. If you'd like to contribute to the interactive examples project, please clone and send us a pull request. Examples Using indexOf The following example uses indexOf to locate values in an array. If you'd like to contribute to the interactive examples project, please clone and send us a pull request. Specifications Specification Status Comment Draft Initial definition.
Return value An array containing the given object's own enumerable property values. Return value The value of the first element in the array that satisfies the provided testing function; otherwise, is returned. Call predicate, T, « kValue, k, O ». The ordering of the properties is the same as that given by looping over the property values of the object manually. If the provided index is 0, then the whole array will be searched.
Legend Full support Full support No support No support User must explicitly enable this feature. The range of elements processed by find is set before the first invocation of callback. If IsCallable predicate is false, throw a TypeError exception. Description The find method executes the callback function once for each index of the array until it finds one where callback returns a true value. If same is true, return k. Note: if the provided index is negative, the array is still searched from front to back. Let Pk be ToString k.
This will allow you to use indexOf when there is still no native support. Return value The first index of the element in the array; -1 if not found. Specifications Specification Status Comment Standard Initial definition. This may mean that it's less efficient for sparse arrays than other methods that only visit indexes that have been assigned a value. See also the method, which returns the index of a found element in the array instead of its value. If you'd like to contribute to the interactive examples project, please clone and send us a pull request. If it is not provided, then is used.
The source for this interactive example is stored in a GitHub repository. If testResult is true, return kValue. If an existing, unvisited element of the array is changed by callback, its value passed to the visiting callback will be the value at the time that find visits that element's index; elements that are deleted are still visited. User must explicitly enable this feature. If thisArg was supplied, let T be thisArg; else let T be undefined. The source for this interactive example is stored in a GitHub repository.
. If the index is greater than or equal to the array's length, -1 is returned, which means the array will not be searched. If len is 0, return -1. If the provided index value is a negative number, it is taken as the offset from the end of the array. Elements that are appended to the array after the call to find begins will not be visited by callback. Default: 0 entire array is searched.
If you need to find the position of an element or whether an element exists in an array, use or. If such an element is found, find immediately returns the value of that element. You can work around this by utilizing the following code at the beginning of your scripts. However, you can polyfill Array. If a thisArg parameter is provided to find, it will be used as the this for each invocation of the callback. . .
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