pxt-calliope/libs/core/helpers.ts

namespace console {
    export function log(msg: string) {
        serial.writeString(msg);
        serial.writeString("\r\n");
    }
}

namespace Math {
    /**
     * Generates a `true` or `false` value randomly, just like flipping a coin.
     */
    //% blockId=logic_random block="pick random true or false"
    //% help=math/random-boolean weight=0
    export function randomBoolean(): boolean {
        const v = Math.randomRange(0, 1) * 2;
        return 1 == Math.floor(v);
    }
}