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Counting the Length of an Array

Length of array list

				
					{"blocks":"<xml xmlns=\"https://developers.google.com/blockly/xml\"><variables><variable>array</variable><variable>index</variable><variable>list</variable></variables><block type=\"lists_length\" disabled=\"true\" x=\"112\" y=\"293\"><value name=\"VALUE\"><block type=\"variables_get\" disabled=\"true\"><field name=\"VAR\">list</field></block></value></block></xml>"}
				
			

This block is used show the number of items in the array.

Parameters: Screen Item (Array)

Output: Number

Sample code:

				
					{"blocks":"<xml xmlns=\"https://developers.google.com/blockly/xml\"><variables><variable>text_list</variable></variables><block type=\"pxt-on-start\" x=\"0\" y=\"0\"><statement name=\"HANDLER\"><block type=\"variables_set\"><field name=\"VAR\">text_list</field><value name=\"VALUE\"><shadow type=\"math_number\"><field name=\"NUM\">0</field></shadow><block type=\"lists_create_with\"><mutation items=\"3\" horizontalafter=\"3\"/><value name=\"ADD0\"><shadow type=\"text\"><field name=\"TEXT\">a</field></shadow></value><value name=\"ADD1\"><shadow type=\"text\"><field name=\"TEXT\">b</field></shadow></value><value name=\"ADD2\"><shadow type=\"text\"><field name=\"TEXT\">c</field></shadow></value></block></value><next><block type=\"basic_consoleLogNum\"><value name=\"num\"><block type=\"lists_length\"><value name=\"VALUE\"><block type=\"variables_get\"><field name=\"VAR\">text_list</field></block></value></block></value></block></next></block></statement></block></xml>"}
				
			

The output:

Length of Array List - Output
Next Showing the Value with the Selected Index