From 074785cea106179cb3305637055ab0a009ca74f2 Mon Sep 17 00:00:00 2001 From: Peter Bengtsson Date: Tue, 8 Dec 2020 14:42:52 -0500 Subject: initial commit --- .../global_objects/float64array/index.html | 160 +++++++++++++++++++++ 1 file changed, 160 insertions(+) create mode 100644 files/pt-br/web/javascript/reference/global_objects/float64array/index.html (limited to 'files/pt-br/web/javascript/reference/global_objects/float64array') diff --git a/files/pt-br/web/javascript/reference/global_objects/float64array/index.html b/files/pt-br/web/javascript/reference/global_objects/float64array/index.html new file mode 100644 index 0000000000..63a7ae3f33 --- /dev/null +++ b/files/pt-br/web/javascript/reference/global_objects/float64array/index.html @@ -0,0 +1,160 @@ +--- +title: Float64Array +slug: Web/JavaScript/Reference/Global_Objects/Float64Array +translation_of: Web/JavaScript/Reference/Global_Objects/Float64Array +--- +
{{JSRef}}
+ +

The Float64Array typed array represents an array of 64-bit floating point numbers (corresponding to the C double data type) in the platform byte order. If control over byte order is needed, use {{jsxref("DataView")}} instead. The contents are initialized to 0. Once established, you can reference elements in the array using the object's methods, or using standard array index syntax (that is, using bracket notation).

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Constructor

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Float64Array()
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Cria um novo objeto Float64Array
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+ +

Static properties

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{{jsxref("TypedArray.BYTES_PER_ELEMENT", "Float64Array.BYTES_PER_ELEMENT")}}
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Retorna um valor numerico de tamanho . 8 no caso de um Float64Array.
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{{jsxref("TypedArray.name", "Float64Array.name")}}
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Retorna uma string com o nome do contructor. no caso deFloat64Array type: "Float64Array".
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+ +

Static methods

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{{jsxref("TypedArray.from", "Float64Array.from()")}}
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Cria um novo Float64Array a partir de um array-like ou um objeto iteravel . tambem como {{jsxref("Array.from()")}}.
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{{jsxref("TypedArray.of", "Float64Array.of()")}}
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Cria um novo Float64Array com um numero variado de argumentos. tambem como {{jsxref("Array.of()")}}.
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+ +

Instance properties

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{{jsxref("TypedArray.prototype.buffer", "Float64Array.prototype.buffer")}}
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Returns the {{jsxref("ArrayBuffer")}} referenced by the Float64Array Fixed at construction time and thus read only.
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{{jsxref("TypedArray.prototype.byteLength", "Float64Array.prototype.byteLength")}}
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Returns the length (in bytes) of the Float64Array from the start of its {{jsxref("ArrayBuffer")}}. Fixed at construction time and thus read only.
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{{jsxref("TypedArray.prototype.byteOffset", "Float64Array.prototype.byteOffset")}}
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Returns the offset (in bytes) of the Float64Array from the start of its {{jsxref("ArrayBuffer")}}. Fixed at construction time and thus read only.
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{{jsxref("TypedArray.prototype.length", "Float64Array.prototype.length")}}
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Returns the number of elements hold in the Float64Array. Fixed at construction time and thus read only.
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+ +

Instance methods

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{{jsxref("TypedArray.copyWithin", "Float64Array.prototype.copyWithin()")}}
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Copies a sequence of array elements within the array. See also {{jsxref("Array.prototype.copyWithin()")}}.
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{{jsxref("TypedArray.entries", "Float64Array.prototype.entries()")}}
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Returns a new Array Iterator object that contains the key/value pairs for each index in the array. See also {{jsxref("Array.prototype.entries()")}}.
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{{jsxref("TypedArray.every", "Float64Array.prototype.every()")}}
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Tests whether all elements in the array pass the test provided by a function. See also {{jsxref("Array.prototype.every()")}}.
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{{jsxref("TypedArray.fill", "Float64Array.prototype.fill()")}}
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Fills all the elements of an array from a start index to an end index with a static value. See also {{jsxref("Array.prototype.fill()")}}.
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{{jsxref("TypedArray.filter", "Float64Array.prototype.filter()")}}
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Creates a new array with all of the elements of this array for which the provided filtering function returns true. See also {{jsxref("Array.prototype.filter()")}}.
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{{jsxref("TypedArray.find", "Float64Array.prototype.find()")}}
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Returns the found value in the array, if an element in the array satisfies the provided testing function or undefined if not found. See also {{jsxref("Array.prototype.find()")}}.
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{{jsxref("TypedArray.findIndex", "Float64Array.prototype.findIndex()")}}
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Returns the found index in the array, if an element in the array satisfies the provided testing function or -1 if not found. See also {{jsxref("Array.prototype.findIndex()")}}.
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{{jsxref("TypedArray.forEach", "Float64Array.prototype.forEach()")}}
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Calls a function for each element in the array. See also {{jsxref("Array.prototype.forEach()")}}.
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{{jsxref("TypedArray.includes", "Float64Array.prototype.includes()")}}
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Determines whether a typed array includes a certain element, returning true or false as appropriate. See also {{jsxref("Array.prototype.includes()")}}.
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{{jsxref("TypedArray.indexOf", "Float64Array.prototype.indexOf()")}}
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Returns the first (least) index of an element within the array equal to the specified value, or -1 if none is found. See also {{jsxref("Array.prototype.indexOf()")}}.
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{{jsxref("TypedArray.join", "Float64Array.prototype.join()")}}
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Joins all elements of an array into a string. See also {{jsxref("Array.prototype.join()")}}.
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{{jsxref("TypedArray.keys", "Float64Array.prototype.keys()")}}
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Returns a new Array Iterator that contains the keys for each index in the array. See also {{jsxref("Array.prototype.keys()")}}.
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{{jsxref("TypedArray.lastIndexOf", "Float64Array.prototype.lastIndexOf()")}}
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Returns the last (greatest) index of an element within the array equal to the specified value, or -1 if none is found. See also {{jsxref("Array.prototype.lastIndexOf()")}}.
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{{jsxref("TypedArray.map", "Float64Array.prototype.map()")}}
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Creates a new array with the results of calling a provided function on every element in this array. See also {{jsxref("Array.prototype.map()")}}.
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{{jsxref("TypedArray.reduce", "Float64Array.prototype.reduce()")}}
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Apply a function against an accumulator and each value of the array (from left-to-right) as to reduce it to a single value. See also {{jsxref("Array.prototype.reduce()")}}.
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{{jsxref("TypedArray.reduceRight", "Float64Array.prototype.reduceRight()")}}
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Apply a function against an accumulator and each value of the array (from right-to-left) as to reduce it to a single value. See also {{jsxref("Array.prototype.reduceRight()")}}.
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{{jsxref("TypedArray.reverse", "Float64Array.prototype.reverse()")}}
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Reverses the order of the elements of an array — the first becomes the last, and the last becomes the first. See also {{jsxref("Array.prototype.reverse()")}}.
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{{jsxref("TypedArray.set", "Float64Array.prototype.set()")}}
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Stores multiple values in the typed array, reading input values from a specified array.
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{{jsxref("TypedArray.slice", "Float64Array.prototype.slice()")}}
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Extracts a section of an array and returns a new array. See also {{jsxref("Array.prototype.slice()")}}.
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{{jsxref("TypedArray.some", "Float64Array.prototype.some()")}}
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Returns true if at least one element in this array satisfies the provided testing function. See also {{jsxref("Array.prototype.some()")}}.
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{{jsxref("TypedArray.sort", "Float64Array.prototype.sort()")}}
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Sorts the elements of an array in place and returns the array. See also {{jsxref("Array.prototype.sort()")}}.
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{{jsxref("TypedArray.subarray", "Float64Array.prototype.subarray()")}}
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Returns a new Float64Array from the given start and end element index.
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{{jsxref("TypedArray.values", "Float64Array.prototype.values()")}}
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Returns a new Array Iterator object that contains the values for each index in the array. See also {{jsxref("Array.prototype.values()")}}.
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{{jsxref("TypedArray.toLocaleString", "Float64Array.prototype.toLocaleString()")}}
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Returns a localized string representing the array and its elements. See also {{jsxref("Array.prototype.toLocaleString()")}}.
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{{jsxref("TypedArray.toString", "Float64Array.prototype.toString()")}}
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Returns a string representing the array and its elements. See also {{jsxref("Array.prototype.toString()")}}.
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{{jsxref("TypedArray.@@iterator", "Float64Array.prototype[@@iterator]()")}}
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Returns a new Array Iterator object that contains the values for each index in the array.
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+ +

Examples

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Different ways to create a Float64Array

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// From a length
+var float64 = new Float64Array(2);
+float64[0] = 42;
+console.log(float64[0]); // 42
+console.log(float64.length); // 2
+console.log(float64.BYTES_PER_ELEMENT); // 8
+
+// From an array
+var arr = new Float64Array([21,31]);
+console.log(arr[1]); // 31
+
+// From another TypedArray
+var x = new Float64Array([21, 31]);
+var y = new Float64Array(x);
+console.log(y[0]); // 21
+
+// From an ArrayBuffer
+var buffer = new ArrayBuffer(32);
+var z = new Float64Array(buffer, 0, 4);
+
+// From an iterable
+var iterable = function*(){ yield* [1,2,3]; }();
+var float64 = new Float64Array(iterable);
+// Float64Array[1, 2, 3]
+
+ +

Specifications

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Specification
{{SpecName('ESDraft', '#table-49', 'TypedArray constructors')}}
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Browser compatibility

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{{Compat("javascript.builtins.Float64Array")}}

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See also

+ + -- cgit v1.2.3-54-g00ecf