ESP8266 part of the f105-motor-demo project (see f105-motor-demo_stm32)
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@charset "UTF-8";
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/// Checks for a valid number.
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///
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/// @param {Number} $value
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///
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/// @require {function} contains
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@function is-number($value) {
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@return contains("0" "1" "2" "3" "4" "5" "6" "7" "8" "9" 0 1 2 3 4 5 6 7 8 9, $value);
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}
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