We used the device to map three-dimensional distributions of the Young’s modulus of tissues ex vivo, to detect microstructural damage in the muscles of volunteers before the onset of soreness and to monitor the dynamic recovery process of muscle injuries during physiotherapies.
Array method map skin#
The array conforms to human skin and acoustically couples with it, allowing for accurate elastographic imaging, which we validated via magnetic resonance elastography.
Array method map serial#
Here we describe a stretchable ultrasonic array for performing serial non-invasive elastographic measurements of tissues up to 4 cm beneath the skin at a spatial resolution of 0.5 mm. However, current methods are invasive, can be used only for short-term measurements, or have insufficient penetration depth or spatial resolution. Serial assessment of the biomechanical properties of tissues can be used to aid the early detection and management of pathophysiological conditions, to track the evolution of lesions and to evaluate the progress of rehabilitation. map( callback function ( currentValue, index, array), this.Arg)Ĭonsider the following code: const numArray = Ĭonst numArrayMult = numArray.Stretchable ultrasonic arrays for the three-dimensional mapping of the modulus of deep tissue The method accepts a callback function, which takes the currentValue, index, and the return array as arguments, providing a new array as output:Īrray. The syntax of the map() method is straightforward. Use reduce() whenever it is crucial that you work with a single value built from the underlying array. For example you can use reduce() to sum all of the values of the array, or to retrieve the highest value in the array. reduce() is used to reduce an array to a single value.The final length of the return value depends on how many items met the required condition. Given this, the filter() method may return an array with the same length, an empty array, or something in between. filter() returns an array containing items that meet a certain condition (e.g.forEach() returns undefined, preventing us from chaining methods together.map() returns a new array with the same length as the parent array.When comparing map() versus forEach(), filter(), and reduce(), it is important to note that while all of these methods iterate through an array, they differ in their return value:
The new array ( numArrayMult) has the same length ( 5) as the input array, and all items were manipulated in the same manner (i.e.
In the example above, which uses the abbreviated map() syntax, numArray was not changed at all. (This example uses abbreviated syntax, more complex version will be exemplified below the Syntax)
Array method map code#
The results of this activity are returned to us inside a new array.įor example, the following code iterates through an array of numbers and multiplies each number by 2: const numArray = Ĭonst numArrayMult = numArray.map(num => num*2) Ĭonsole.log(numArrayMult) //Output: Ĭonsole.log(numArray) //Output: Using map() allows us to iterate through all items in an array, performing actions on each item. – it helps us iterate through a dataset, applying the specified actions to each element. Map is an Iteration Method, and like other such methods – forEach(), filter(), reduce() etc. Array map() is a method included in the Array.prototype property which was introduced in ECMAScript 5 (ES5) and is supported in all modern browsers.
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