Returns a boolean if this buffer and otherBuffer have the same bytes. The values refer to individual bytes, so the legal range is between 0x00 and 0xFF hex or 0 and 255. JSON.stringify implicitly calls this function when stringifying a Buffer instance. Returns a JSON-representation of the Buffer instance. Defaults to false.īuf.readUIntBE(offset, byteLength)īuf.readIntLE(offset, byteLength)īuf.readIntBE(offset, byteLength)ĭecodes and returns a string from buffer data encoded using the specified character set encoding. It means that the offset may be beyond the end of the buffer. Set noAssert to true to skip validation of offset. Defaults to false.īuf.writeUIntBE(value, offset, byteLength)īuf.writeIntLE(value, offset, byteLength)īuf.writeIntBE(value, offset, byteLength)īuf.readUIntLE(offset, byteLength)Ī generalized version of all numeric read methods. Set noAssert to true to skip validation of value and offset. Writes a value to the buffer at the specified offset and byteLength. Returns the number of octets written.īuf.writeUIntLE(value, offset, byteLength) offset defaults to 0, encoding defaults to 'utf8'. Writes a string to the buffer at offset using the given encoding. It does not change when the contents of the buffer are changed. length refers to the amount of memory allocated for the buffer object. Note that this is not necessarily the size of the contents. Otherwise, a RangeError will be thrown here.Ĭopies the passed buffer data onto a new Buffer instance.Īllocates a new buffer containing the given str. Note that the size must be no more than kMaxLength. ExampleĪllocates a new buffer of size octets. If undefined, the targetStart and sourceStart parameters default to 0, while sourceEnd defaults to buffer.length. Copies data from a region of this buffer to a region in the target buffer even if the target memory region overlaps with the source. SourceEnd − Number, Optional, Default: buffer.length SourceStart − Number, Optional, Default: 0 TargetStart − Number, Optional, Default: 0 TargetBuffer − Buffer object where buffer will be copied. When the above program is executed, it produces the following result −įollowing is the syntax of the method to copy a node buffer −īuf.copy(targetBuffer) ExampleĬonsole.log(buffer1 +" comes before " + buffer2) Ĭonsole.log(buffer1 +" is same as " + buffer2) Ĭonsole.log(buffer1 +" comes after " + buffer2) If there is not enough space in the buffer to fit the entire string, it will write a part of the string. This method returns the number of octets written. Defaults to buffer.length.Įncoding − Encoding to use. Length − This is the number of bytes to write. Offset − This is the index of the buffer to start writing at. String − This is the string data to be written to buffer. Here is the description of the parameters used − Writing to Buffers Syntaxįollowing is the syntax of the method to write into a Node Buffer −īuf.write(string) Though "utf8" is the default encoding, you can use any of the following encodings "ascii", "utf8", "utf16le", "ucs2", "base64" or "hex". Var buf = new Buffer("Simply Easy Learning", "utf-8") Var buf = new Buffer() įollowing is the syntax to create a Buffer from a given string and optionally encoding type − Method 1įollowing is the syntax to create an uninitiated Buffer of 10 octets −įollowing is the syntax to create a Buffer from a given array − Node Buffer can be constructed in a variety of ways. Node provides Buffer class which provides instances to store raw data similar to an array of integers but corresponds to a raw memory allocation outside the V8 heap.īuffer class is a global class that can be accessed in an application without importing the buffer module. While dealing with TCP streams or the file system, it's necessary to handle octet streams. Pure JavaScript is Unicode friendly, but it is not so for binary data.
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