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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/SpeechGrammarList/length below:

SpeechGrammarList: length property - Web APIs

SpeechGrammarList: length property

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The length read-only property of the SpeechGrammarList interface returns the number of SpeechGrammar objects contained in the SpeechGrammarList.

Value

A number indicating the number of SpeechGrammar objects contained in the SpeechGrammarList.

Examples
const grammar =
  "#JSGF V1.0; grammar colors; public <color> = aqua | azure | beige | bisque | black | blue | brown | chocolate | coral | crimson | cyan | fuchsia | ghostwhite | gold | goldenrod | gray | green | indigo | ivory | khaki | lavender | lime | linen | magenta | maroon | moccasin | navy | olive | orange | orchid | peru | pink | plum | purple | red | salmon | sienna | silver | snow | tan | teal | thistle | tomato | turquoise | violet | white | yellow ;";
const recognition = new SpeechRecognition();
const speechRecognitionList = new SpeechGrammarList();
speechRecognitionList.addFromString(grammar, 1);
recognition.grammars = speechRecognitionList;

speechRecognitionList.length; // should return 1.
Specifications Browser compatibility See also

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